20m vertical antenna homebrew. First I worked out a 1/4 wavelength of 14.

20m vertical antenna homebrew 3 days ago · The connections have to be solid or the antenna system will not function right. Locally there was no supplier of aluminum for a vertical. I build this impedance match device and antenna elements. JO21fe61bc. Length of the vertical element:--You can shorten your vertical antenna by using a loading coil. 3m (7. Vertical works better. 25 wavelength 20 meter vertical antenna projects category is a curation of 13 web resources on , A Simple High-Performance Vertical Antenna, 20m T-Monopole, Vertical moxon for 14 Mhz. Its overall size is around 30% less than a full-sized beam. This shortened easy-to-build vertical, with no-radials, is made from surplus military camouflage poles. cm) change in antenna length shifts the frequency by 350 KHz. I like to experiment with antennas and have built many dipoles for the various bands. Using the 20m EFHW on 10m 5. ) After that we couldn’t wait to get the K1 hooked up and start operating. End fed halfwave vertical for 20m HF Wire Antennas The Antenna is suitable for home or portable use. Can use a 40m efhw if you have taller trees and are a good shot. 7. Read More… A multi-band trap vertical antenna for the 10, 15 and 20 meter amateur radio bands. A full-sized 20m 2-element beam is over 10m (32 feet) long, and 2. Vertical Antennas Projects category is a curation of 192 web resources on , Vertical antenna for 40 and 80m, Multiband HF Vertfical Antenna, G8JNJ Broadband HF Vertical Antenna. The center lead of the coax forms one half of the dipole and the braid forms the other. The article by K7ZB introduces a simple 10-20m DX antenna suitable for deed-restricted lots. So were 30-foot long bamboo poles to mount the vertical. 1 Meter(13. That’s been my experience. Antenna for deed restricted lots An effective 10-20m DX antenna for deed restricted lots. html A desirable characteristic of this antenna is that it performs well without an antenna tuner. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials . digitalshack. Depending on your choice, you may prefer this reduction in size, when you're working with an antenna as large as 20m band antenna are. See latest feedback near bottom of article! That's 20, 17, 15, 12 and 10 meters! End fed 20/30 Meter Antenna-- From W0VLZ Verticals. mehr als eine Kompromiss-Antenna?" [6-20m, 6-band 2 Apr 19, 2023 · Going portable with the easy to build “Coastal 20” vertical no-radial multiband HF antenna for 20 through 10 meters #hamradio #hamradioantenna #verticalantenna Shark Antennas S-F20 Mono Band HF 20 Meter Mobile Vertical Antenna with 3/8x24 Threads, Handles 250W Max Professional End Fed Antenna, 4 Band 20m, 8 Band 40. If you need a simple, inexpensive 20 meter vertical antenna that works, try Rob's ("SevenFortyOne") idea outlined in this excellent video. uk/baluns You are watching me put together a 20 meter ham radio vertical antenna constructed from surplus military tent poles and tape measuresEnjoy!Amazon Store: h Find HF Vertical Antennas and Packages 20 meters HF Vertical Antenna Band and get Free Shipping on Most Orders Over $99 at DX Engineering! ” order_by=”sortorder” order_direction=”ASC” returns=”included” maximum_entity_count=”500″] QRPGuys Portable 40/30/20m Tri-Band Vertical Antenna – $30 Due to an illness and subsequent surgery, we will be closed until early December. G0KYA's Amateur Radio Blog: The EFHW - an efficient monoband end-fed half wave for 10m, 20m or any other HF band antenna system. I have built the same thing for 20M in the past with the same result. Jul 9, 2018 · While it would be easy enough to homebrew, the ergonomics of the switches, the hardware to attach the antenna wire and radials, and the clever PCB setup are enough to make it worth the $15 to just buy the darn thing. 20 Meter Antennas 20M 3 Element Monobander-- From The ARRL K5OE Antennas-- HF Antennas - 10/15/20 m Dipoles VE3GK's Homebrew Site-- 7Element 20M Yagi 63ft Boom 20M Yagi Optimized Wideband Antenna 20M Delta Loop Moxon Antenna Projects-- 17M and 20M Via KD6WD Verticals 17 Meter Antennas Aug 30, 2017 · The Moxon is a really great antenna design. Resources listed under 20 M Vertical category belongs to 20M main collection, and get reviewed and rated by amateur radio operators. Apr 17, 2023 · Performance on the HF bands is incredibly impressive with this antenna. Great antenna for working 20m band DX. The antenna is fed at the bottom as with any other vertical construction with 50 ohm coaxial cable and all vertical 1/4 wave vertical elements are connected together at the base of the PVC tubing and they are connected to the center conductor of the coax. I have a 17M quarter wave vertical on the ground with loads of radials and another 17M vertical dipole about 30 feet away that is a half wavelength off the ground (same as your potential setup). Jul 26, 2022 · Set up tripod, attach antenna, clap the radials and roll them out & secure with small ‘tent pegs’ of the bent wire variety. I’ve been using my 40m/30m/20m end fed half wave antenna very successfully on SOTA activations but it requires a reasonable amount of space. After the isolating coils at the bottom I would use a 50 ohm feed line into shack. Later I raised the Halo to 12m. 1/8 Wave Radials? Turning to my trusty ^antenna bible, the ARRL Antenna ook [7], I found the following: Practical Suggestions for Vertical Ground Systems At least 16 radials should be used if at all possible. I mounted these on two 6' 2x4's simply driven into the ground about 1 foot. vertical antenna, made from three 10 ft. For a ground mounted quarter-wave vertical, a minimum of 20 radials, each 20 feet long, should be used. Apr 15, 2020 · GOOZEEZOO Radio Antennas JPC-12 HF Antennas for Ham Radio with Slide Regulator 7MHz-50MHz All Band Hf Vertical Antenna 40m-6m 8 Bands JPC-12 Antenna for Outdoor 4. Aug 11, 2022 · Superlight SOTA Vertical for 40-30-20m with Loading Coil by mfhepp. m Elevated Vertical “fishing pole” antenna alongside the 40m Vertical. Total cost for all parts is less than $100 and assembly is pretty simple. Mar 26, 2021 · I just built a homebrew antenna that consists of a full-length quarter-wave vertical sized for 20m, with a "top hat" consisting of a Hustler VP-1 and trio of Hustler mobile resonators (RM-80S, RM-40, and a RM-20 with extra-long whip repurposed to do 30m instead). I changed the antenna configuration again - just for fun and out of curiosity. It’ll not cost too much and it will perform very well. I compared antennas on a number of signals and the vertical is consistently a couple S units lower on receive. Thanks to Stuart M0OVG @ G8AMC radio club. Braun's array comprised three vertical monopole antennas, placed at the corners of an equilateral triangle. May 6, 2022 · Very easy to make and take portable or use as you need to at home. Technical support via email is the only service available until then. See latest feedback near bottom of article! That's 20, 17, 15, 12 and 10 meters! After moving to South America I needed a simple antenna to get back on the air. Feb 5, 2022 · Here's another great 20 meter antenna idea for radio amateurs facing restricted spaces on small urban lots. co. By John Portune W6NBC . Which makes it more difficult to deploy the radials when in a heavily wooded POTA activation. 6. How I build this easy Quarterwave Vertical antenna for 20 meters. If antenna trimming is required, proceed to incrementally Coil Vertical Antenna 60m / 40m / 30m / 20m Version 1. At that height it outperformed the vertical by at least one to two S-points. They are a really simple design and are easy to work on since they do not require a tower. Construction of my 20m vertical half wave antenna. uk/spiderpole-12m. 310 MHz my preferred SOTA operating frequency. The 20m halo top-hat loading capacitor is obscured by the branch of the nearby tree. I have a ton of RG6 in my basement and I’m wondering if I could use it to make a flower pot antenna. Construction time is about 10 hours. Original article by K7ZB The simple 15′ vertical antenna shown mounted on the railing of our second floor deck has produced almost 200 countries worked around the world… VQ9’s in Chagos and 3B8’s on Mauritius in the Indian Ocean, TX0DX on Chesterfield Reef, VK0MM on Macquarie Island in the Antarctic region, BQ9P on Pratas IslandRead More 4 days ago · 20m delta loop This antenna is fed for vertical polarisation, to give a low angle of radiation for DX and also a nearly omni-directional radiation pattern. this antenna project came out very nice it s a rugged homebrew multi band trap vertical antenna that works the 10 15 and 20 meter amateur radio bands the antenna can be mounted on the ground or on a mast mounted on the ground the antenna has a low take off angle for working dx if mounted on a mast the antenna will acheive both a low angle as well as another radiation lobe that has a much THE KL7JR 5 BAND PIPE VERTICAL by John Reisenauer, Jr. . This antenna is simply the top half of the center-loaded vertical mini-dipole shown above, but this time loaded with a Slinky ® coil counterpoise below it. Why Are Vertical Antennas Noisy? During a QSO with an “F” call recently on 40 metres, he commented that he was using a homebrew vertical antenna and had quite a bit of noise at his end. I ended up with 34 turns on a T130-2 toroid core. They have been very effective, especially on 20m where I make most of my contacts. It is a 25 ft. Interchange lengths for 5 band HF fun in the Wild! In my younger days on portable island activating adventures, I used a homebrew multi-banded quarter-wave vertical antenna that was easy to assemble and disassemble and didn't take up a lot of space in my canoe. The antenna is ideal for use with a 6m fiber-glass or carbon-fiber mast. Also includes how to tune coaxial cable traps using the MFJ grid dip mete Homepage van Maarten Ouwehand PG1N. EFHW featured in "Stealth Antennas" 3. I wanted high efficiency 40 Meter antenna with low-angle radiation. Apr 12, 2020 · This antenna is made from either an old CB whip or a stripped-down 2m 5/8 whip. The antenna can have a slope or a slant to it. #hamradio #amateurradio #antenna Amazon link to telescopic pole:https://a. Picture shows the shorter . I have 2 elements on it which will tune up on 40m, 20m, and 15m without a tuner and most others with Save yourself a step, build a vertical dipole. I have 75 feet of wire to work with for a vertical element, and I was wanting to use 75 and 40 meters. Aug 23, 2011 · I have taken this antenna design, Build your own 20m vertical by dxzone. Oct 10, 2014 · After building a 5/8 for 20m we compared received signals with a Hy-Gain AV-12AVQ (vertical for 10/15/20m, acts as a 1/4 wave for 20m). 125Mhz (centre of the 20M band) using this formula: Homepage van Maarten Ouwehand PG1N. Tune an antenna analyzer or transceiver to the center of the 20 meter band, 14175 MHz, and check the SWR. Slingshot or arborist throw line up a limb and let it hang totally straight up n down. PVC sections bolted together, and 1/2 wavelength of antenna wire helically wound around the PVC sections. "Tech Minds" does a good job of explaining how the T2LT design works and listing some of the considerations needed to build this type of antenna. SIDER POLE: https://hamradiostore. The antenna is based on work done by Stuart (M0OVG). Initially my first attempt was to have a 1/4wave (90deg) spacing on the verticals, and feeding these with the newly made switch box via the Christman method of 84deg lines to each vertical, and switch the 71deg phasing to either antenna for end fire patterns. Three bands in one antenna with low angle take off for DX!Connect with my channel by subsc Aug 1, 2024 · Multiband Center-Loaded Off-Center-Fed Dipole (CL-OCFD) antenna that work on 80m 40m 30m 20m 15m 10m. 00; Description: The 5/8 wave 20 meter vertical is a 40 to 43 foot long antenna hand made from heavy duty t-832 tubing. If SWR adjustment is needed, start by connecting the matchbox to the antenna wire. To avoid needing long radials I still wanted it to be a half Sep 3, 2011 · 20M seemed the obvious choice as I could use the 10M pole to create a 1/4 vertical with radials. Here is what I have: 10M fibreglass fishing pole Lots of Racal antenna wire some lengths of rg58 coax Insulation tape BNC chassis socket Some thin cord/rope. Without Radials . Modelling it on EzNEC software it shouldn’t be that great on bands above 20m however, it seems to defy the modelling software as it performs amazingly well on 17m, 15m and 12m, better than any other vertical antenna I’ve made for those bands. Using the standard formula of 468 divided by frequency (MHz) we get the following lengths for each leg of our antenna: (going lower than 20M the lengths get unmanageable) Using an MFJ-259B antenna analyzer, we found we were able to tune the antenna all the way from 80m to 10m, with low SWR and close to 50 ohms on all major bands (after careful adjustment of both top whip length and coil tapping below 20m. com, and I have some very, very tall trees in the back of the property. With a vertical antenna system, the radials are the second half of the antenna. Mount the antenna to a pole making sure to clamp the antenna to the mast at a point below the decoupling sleeve area. g8amc. uk/20m-t2l Jan 21, 2024 · This is my version of a home made ground mount HF multi band antenna that covers 10m, 12m, 15m, 17m, 20m, 30m, and 40m. So again I built this old standard vertical antenna. Big 2 1/8 inch bottom section tapers to 1/2 inch at the top. Attach a wattmeter or SWR bridge to the antenna. 5:1 you can adjust the decoupling sleeve slightly up or down for the best reading. High Performance 40 Meters Vertical . Experimental measurements and calculations show that with this number, the loss resistance decreases the antenna efficiency by 30% to 50% for a 0. the rest were at 20 watts. QRPGuys EFHW Antenna 40m-15m or 80m with Tuner; Center Loaded Vertical Antenna kit; QRPGuys DS1 40m -10m Antenna; QRPGuys 40m-10m UnUnTenna; QRPGuys 40m-10m UnUnTenna Plus; QRPGuys Portable Tri-Band Vertical Antenna 40/30/20m; QRPGuys No Tune End Fed Half Wave Antenna 80-10m; QRPGuys Wire Antenna Trap Kit; QRPGuys Multi-Band End Fed "If I can hear it, I can work it and this antenna hears well. The EFHWV 20M Favours DX due to it's low, 15 degree off the horizon angle of radiation, What this means is your signal will travel much lower out from the antenna as a result bouncing off the ionosphere at a much further distance giving you a much longer For the last 15 minutes I searched but can’t find any kind of mast that isn’t over $100 or above 20’. Three of those were at 5w. Software Modelling your Vertical antenna ground radials with MMANA; DX Commander now shipping to USA / Canada / Aus; Vertical Antenna – How many Ground Mounted Radials Do I Need; M0MCX Banana Antenna – an end-fed choke sleeve resonant feedline T2LT antenna design; 20m band End-Fed Choked Coax Dipoles (T2LT) Oct 8, 2013 · 20m shunt inductor The 20 meter vertical could only get just barely below a 2:1 swr at resonance (a good thing really!), and it benefited from adding a small shunt coil across the antenna terminals which brought this down to 1:1 for those that really need to do this. But if you really want just one band, you can cut a piece of copper pipe to exactly a quarter wave of 20M, roughly 200 inches long, and add some radials of various long lengths. If the SWR is over 1. Antennas; 20m Projects Receivers CW Transceivers It's a rugged homebrew multi-band trap vertical antenna that works the 10, 15, and 20 meter amateur radio bands Antennas. January 15, 2025. Putting together my first HF ham shack and I’m looking at homebrew antenna ideas. When you strip down and re-shrink an antenna, be careful because some heat shrink tubes can change the antenna’s resonance, especially with helical windings. However wood, wire, screw-in eyebolts and long bolts were available. ON3JT. The antenna dimensions shown in Figure 3 are close to optimal, and can be scaled for use on other bands. Using the EFHW for 20m at GB0CMS 3. My three ground plane wires are 1/4 wave long on 20m. It is a redesign of the approach of an antenna marketed by QRPguys A vertical dipole antenna has constant gain in any horizontal direction, but zero gain in vertical direction (3). I thought it would be interesting to try a vertical so that on busy summits (or in other portable locations) I could just bungee my 6m fishing pole to a fence post and get quickly on the air. An overview and where it all started 2. It's a rugged homebrew multi-band trap vertical antenna that works the 10, 15, and 20 meter amateur radio bands. Since this is too short for a full 1/4 wavelength vertical for 20m I decided I would try top loading the antenna to make it resonant. hamgoodies. They are well suited for Four Square arrays from COMTEK and DX Engineering or any other four-square array systems. A capacitance hat is on top, and the antenna is fed with a 50-ohm feedline. I have been using quarter wave vertical whips in the past; usually ground-mounted with 4 radial wires. Mar 12, 2022 · One huge advantage of a half wave over a quarter wave antenna is that the point of max current is 50% along the antenna’s length, on the 20m band EFHW Vertical this puts it some 5m above the ground lowering the angle of take off and making it a great DX antenna. I’m looking for something about 33’ tall so I can play with 1/2 wave 20m antennas and then 1/4 40m with a counterpoise. Feb 14, 2024 · An EFHW for 10m, 20m and 40m is one of my go-to antennas in the field. Instead of 4 radials of 5,2 m I now have 8 radials of 2,5 m. ½ λ antenna for 50MHz FM af OZ2M Formålet med den denne side er at beskrive en ½ λ vertikal endepunktsfødet antenne til 70 MHz, baseret på et design til 50 MHz af DK7ZB, og hvordan du nemt kan efterbygge den. More remarkable and not less important: the noise level was noticeably lower, probably due to the fact that the 5/8 is a monoband antenna and Apr 22, 2008 · Still using the 4 radials of 5,2m (1/4 wave on 20m) the antenna was not usable. Just don’t hang it up horizontally. That's 20, 17, 15, 12 and 10 meters! One problem I had with the original 40 meter vertical antenna, was that I used two 1/4 wave radials, which conventional wisdom says you should use with vertical antennas. The radials contribute to the radiation efficiency of the entire vertical antenna system. The antenna itself is an off-center fed vertical dipole made by flipping an electrical quarter wavelength of braid back over the outside of the coax. DX signals were in most cases just a bit stronger on the 5/8. I know that people use non-resonant 43 foot It is a 24. Jun 29, 2021 · Cheap Antennas Homebrew Homebrew Antennas Lake James State Park (US-2739) Parks On The Air (POTA) POTA QRP Speaker Wire Antenna Xiegu Xiegu X5105 Post navigation Previous Post Max’s super simple feet for the Icom IC-705 Next Post Guest Post: Field Day – 200 QSOs with a Flashlight Battery The tallest vertical support that I had available at the time was a 10 foot long wooden pole. Comparing Greyline Performance HF vertical antenna & HOA Flagpole Antenna to the famed 43-foot vertical Sep 17, 2017 · Thank you for sharing the notes on this lightweight portable vertical antenna. First I worked out a 1/4 wavelength of 14. Creation date : 11/08/2007 @ 19:11 Last update : 17/09/2024 @ 23:32 Category : Multiband HF Projects Page read 63648 times May 26, 2020 · Easy peasy to build and a very effective antenna for DX!Details of the mini 1:1 current Balun are here: https://www. 5Ft) (M10) Shark Antennas S-FM30 Mono Band HF 30 Meter Mini Mobile Vertical Antenna with 3/8x24 Threads, Handles 250W Max SIMPLE ANTENNAS - MY HOMEBREWS; 3 ELEMENTS YAGI (you can see and try to make it) All Bands Vertical Antenna-HF (homebrew) MY DX FOR FEBRUARY 2011; My 4 element monoband Yagi ( 28Mhz) My Homebrew 3 Elements 20m Monoband Yagi; EASY ROTARY DIPOLE FOR 10m, 15m , 20m; My 2 elements 15m and 20m monoband Yagi Feb 24, 2021 · At that height, the antenna on the 20 meter band performed just as well in terms of transmission as my 13m long full-size 5/8 vertical. Review Summary For : ZeroFive Antennas 20 Meter 5/8 wave vertical; Reviews: 9 MSRP: 299. By accident I noticed when I rearranged the radials to a 1/8 wave on 20m everything worked. THE KL7JR 5 BAND PIPE VERTICAL by John Reisenauer, Jr. Resources listed under Vertical Antennas category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. The calculated length is approximate. They are identical in performance. Jul 1, 2017 · Raising the antenna too high causes secondary lobes to form, raising the peak elevation angle, which reduces the antnena's DX capabilities. More about earthing/ground radials 4. The antenna can be mounted on the ground or on a mast. We will open when you see the PayPal buttons appear. The Center-Loaded Off-Center-Fed Dipole (CL-OCFD) antenna, developed by Serge Stroobandt, offers a versatile solution for amateur radio enthusiasts, covering multiple HF bands (80, 40, 30, 20, 15, and 10 meters) without the need for an antenna tuner. org homebrew equipment Mar 26, 2017 · I have been looking for a better 20m DX antenna while I wait to get a beam up. 20. Comes complete with tuning network and fold over mount. PVC sections bolted together, and ½ wavelength of antenna wire helically wound around the PVC sections. May 15, 2020 · Here's another simple antenna to build in the back garden. When setting up the two verticals the height above ground at the feed point / VersaTee equals 10 feet for both verticals. The shield of the coax connects to the radial field which IS REQUIRED. It doesn’t have to be straight up and down. This product is sold A good working hf vertical for the price of a hamburger and fries! by N5VEG. co/d/cf2CmJ4Amazo 2020-07-12 Well, I've now logged ten QSOs with this "completed" antenna in its 40 and 20 meter configurations pictured above. and all but three were on 20 meters. 20 MTR VERTICAL 3 MTR (10 FT) MONOPOLE WITH SLINKY® COIL "COUNTERPOISE" 14-July-08. 5 ft. COMTEK 20VA 20-10 Meter Vertical Antennas. 54 feet) wide! Apr 30, 2018 · Greetings hams! Back at it with another HF antenna - the experimenting never stops This time we're constructing a Portable Vertical Moxon Antenna for 20 Meters using simple hardware and some telescopic poles. In practice it's best to make the antenna a little longer than the calculated value and then trim it to get the best SWR value. 0 - 01/09/2021 This document was written by Bob Fryer - VK1ERF – www. On 40 meters, they are approximately 33 feet long. Steve Nichols G0KYA Contents 1. Using 32 radials at 20 feet long is preferred and highly Mar 23, 2010 · Construction of my 20m vertical half wave antenna. 4m Nov 17, 2010 · G0KYA's blog devoting to amateur radio / ham radio, featuring articles on antennas, propagation, marconi and much more. I’d like to do it myself so I can learn to tune the wire and learn to make the antenna. A practical, cheap monoband or multiband (new!) vertical antenna that is great for DX and very cheap to build. COMTEK 20VA Vertical Antennas are rugged, yet economical quarter wave antennas designed primarily to be used in sets with phased vertical array systems. Jun 30, 2021 · Here we take a look at building a simple 20M Vertical Dipole purely from RG58 Coax. Very fast setup/tear down, flat across ether the CW or phone parts of the band. Detailed construction Have you tried using a regular 9:1 efrw or 20m 49:1/64:1 efhw in a vertical configuration. At the Club’s ( N1FD ) recent VE session a Radio Wavz 20m Dipole was described as having good DX performance when mounted as a vertical. I have a commercial vertical and like it but I wanted to try to build a smaller, simpler light weight vertical for multiple bands. The 20m vertical is only guyed at the top of the duralumin ex-sailboard mast using the 4 Well, I always liked the 4BTV and 5BTV vertical antennas. Apr 11, 2020 · Because of the COVID-19 pandemic, many radio amateurs will spend the 27-28 June 2020 ARRL Field Day at home with their home-based HF/VHF/UHF antennas. " Comparing Greyline HF Vertical Antenna to well-known antennas such as the Hy-gain AV-680 and Cushcraft R9: *The Red inner rings are 80M, blue 40M, green 20M, and orange 10M. The antenna works extremely well on 30 and 40 meters. A simple, cheap and easy to build 33 feet long vertical antenna that works DX on 20 - 10 meters including WARC BANDS. I observed that it is generally accepted that vertical antennas are noisier than horizontal antennas, but I did not know why. Many hams have been told that "higher is better" but this is not true of vertical antennas. Home This antenna is designed for stations having a difficult time putting a decent signal on 160M from small or CC&R'd lots. VSWR is less than 2:1 on the 40m & 30m bands and 1:1 on 14. I modeled a T type configuration where the 10 foot vertical section was top loaded with a horizontal wire. It is best to hang the 20 meter loop in a vertical fashion. , KL7JR A simple, cheap and easy to build 26 feet long vertical antenna that works DX on 20 - 10 meters including WARC BANDS. I found that the Halo was a fraction better than the vertical in terms of reception. Resources listed under 7 MHz Vertical Antenna plans category belongs to 40M main collection, and get reviewed and rated by amateur radio operators. You can use a piece of 20mm conduit for the former of L2 with a. This is a multi-element vertical HF antenna I designed. power handling 3kw cw,6kw ssb. vertical antenna projects for the 40 meters band category is a curation of 45 web resources on , Vertical antenna for 40 and 80m, Slink-ette antenna, The Hudson antenna. Skip to content. Use the Coil-Shortened Vertical Antenna Calculator to see how. This is the enclosure and winder for a superlight, base loaded vertical antenna, mainly for SOTA operating. https://www. bizf sibgil tksi ouhp ohhipr cpme lexkfd oria rwva qego