This is the first 5/8 I've built to start playing around on 11m. Used RG58 and LMR400 for the stub. Followed your clear instructions and ended up with and antenna with SWR 1.2 or lower for 26 - 28.3 MHz and below 1.4 for the rest up to 30MHz. Also got my first CB dx with Brazil from South Africa with a 5/7 5/8 report! Brilliant, inexpensive antenna. Can't wait to tinker around with your other ideas!

Hi Mike I made me the gain master and must say great antenna. from 26Mhz to 28.8 swr 1/3:1. I made some qso's on 27285 FM with UK stations and on 10m band with EI7HBB with a 5/9+. I used RG58 and RG213 for the stub. Because I don't have a westflex coax. I didn't know the length for the stub of the RG213 I started with 1m and the end result is 73cm. for the people using RG213 . 73cm length. Mvg Nic on5ma

Mike, I used your plan to make an antenna. I tried supporting it with pvc pipe, but that acted like a wet noodle so I just hung it from a tree using a pulley system. SWR ranged from 1.05 :1 for 28.460 MHz to 1: 1.16 to 1.22 over the cb range 26.960-27.410 MHz it came in at 51.2 ohmsuntil you got to the lower end of the CB band 26.960 came in at 43 ohms. I'm hearing skip from as far away as Corpus Christy, Texas (I'm in North Carolina) over 1300 miles! I actually conversed with someone about 6 miles away and it was a very clear and strong signal. I used DX 400 max from DX Engeneering for the matching stub. Now I have to get mt 10 meter radio configured correctly. Thanks for the videos!

An excellent job, Mike, so the antenna as the very detailed tutorial. Congratulations and many thanks for the effort for spread our nice hobby! Franc, EA6FS

Just noticed the remake of your last gain master. I will give this a shot. Brilliant tutorial thank you

Quite a nice antenna. Looks like a pretty good antenna for 10-11 meters. Construction was very well explained. Great video!

Great video. Many thanks. I'll try to make this antenna myself.

Hi,good interesting video, I have the 5/8 and the 1/2 wave Gainmaster, but good to know i can make one myself, thanks from Rotterdam.

just made it. one adjustment and it works just fine from 26 to 29 mhz and over. many thanks! 🙂

Nice one. Must make one soon

Mike, really enjoyed this been watching many of your videos. Please keep them coming really enjoying your channel....

Great Build look like you had fun building this antenna 📡 waven four fingers and a thumb from Southern California 🇺🇸

Excellent vid Mike. I made one of these today and have already had reports that my signal is stronger than everyone else from my area. I followed your instructions/measurements exactly and have a usable bandwidth (swr below 2:1) from 24.5Mhz to 29.5Mhz. So that's 10,11 and 12m covered. Incredible. Cheers Adrian G7IWV

Excellent job Mike... I think even I will have to have a crack at this! Many thanks :)

Very interesting and well worth the effort. Thanks for the video.

Great job mike...greeting from Bali

Hi Mike. I’ve made both the 1/2 and 5/8 antennas and find them to be exceptional. I was unable to locate any Westflex so used LMR 400 ultra flex with slight adjustments for the VF. 5/8 is usable from about 24 - 30Mhz. Keep sharing antennas that really work. 73s, Mike ZL1MJB.

nice idea with the tape measure

Hi Mike, here is Emanuel from Campinas, São Paulo Brasil PX2 Q 1323 thanks for your videos, main to antenna gain master.

Great job as always Mike 👍 100m drum so plenty more builds to come then 😉

what a money saver . and fun making to

Awesome stuff Mike. I use a Hawkins radio home brew 5/8 wave for field days works very well.. I have a old Rotel cb27/81 if you get the urge !! Lol... ATB ... M7AVM..

nice trainers!! good videos will have to try this 1 thanks mike! 73s from wales mw0ssb

Nicely done!

I am going to have to watch it again, it looked as if you just used thick coax for the matching stub, but then I was tired at 2;30am and my brain had slowed down. I take it that there was a vast improvement, but I just watched it and it went in one side and out the other! Good video though Mike. I'll be back to watch it again this weekend. Though I can't see me getting to put it up, however, a string fired over a tree and pulled up might work ok. I think it would work well on top of a hill near me that looks south, west and east. I need to obtain a pole to try it. Nice one Mike.

Absolute the best antenna i did make. Tnkx for sharing

It doesn't take a lot of tweaking to get the design to cover 12m and quite a bit of the 10m SSB section within a 2:1 SWR bandwidth. Instead of the air-cored choke I use 12t on an FT240-43 toroid and it works fine - identical performance to the air-cored choke but easier to fit in a pack for portable.

Nice work

nice soldering hack with the tape measure.

Fantastic I have the Sirio Gainmaster 5/8 and a T2LT 5/8 and to be honest there ain’t much difference when I first tested them both in the UK But I’m still to do a another report in my new location here in the Philippines. Love your videos

Enjoyed this vid mate as I have a few others you have produced, please keep 'em coming!.........Neil 2E0EJS

Nice video. Assuming the .66VF of the coax you are using, it looks like it would easily be scalable to build the whole antenna out of RG-213 mil-spec for high-power and be done with it.

Thanks Mike 👍

Very good video indeed Mike, 73s from 2W0EQQ 😃

Mantab...saya akan mencoba. Terima kasih 👍

Hi, thanks a lot for that great video; would be great to hear about the HowTo regarding the 5/8 wave Gainmaster. A summarized list (lenght, capacitor, stub,…) would be good. Best 73, Chris HE9MPU

EXCELLENT EXCELLENT EXCELLENT VIDEO!! THANK YOU!

In trying to understand the difference between the Half Wave and 5/8 of course a matching device is necessary, now I get it along with the 2TLT versions. I guess a 20 meter verson could also be figured out. The 18 meter or nearly 60 ft DX Commander pole would also make the ideal for the first antenna for a CBer, especially with the bands beginning to open up, in the states it is legal to talk to anyone you can reach so skip will be fun this sun cycle unlike my CB days when I became a Federal Law breaker LOL. We all know when that guy across the pond was heard we didn't try to make the contact. I had a contact in Rotterdam that I spoke to from my mobile many mornings working out of my car. His call was PBC123 we spoke on the slot channel below 15 and 16 in those few kcs SSB folks were stuck in 1970 or 71.

Just built one out of old rg58 and some rg8/u for the stub Hanging across the room the swr is pretty dead across 11m into 10m with 5w so try later today on a pole n see how it does rx against an imax if the bands are open Rg8 is .84 so only 4 off on the velocity factor hoping it works as good Tnx for great video Cheers happy hombrewing Pat ☝️💪🍻

Great video

Thank,s for a realy good video,i have nostalgi radio.Sommerkamp TS-288A 24Ch and i want too build this model of antenna. Thank,s again from Sweden

Good tutorial.. Thumbs and 4dB (delicious bananas) up!

Wow so impressive. Do me one I pay yo 🤣 very nice antenna enjoy it 🙏🏻

Using the Hawkins radio 58+ Thunderbolt for a few years now .For Mobile static. Amazing results on 10 and 11 meters. On a fibre glass pole . Feed at 1.5 m extending to 10 m.. all on 100 w. 73s HS0ZOU

Well after watching your video two or three times I think I'm going to build a fiberglass radome from scratch on something like PVC for a former, then remove the PVC if possible I don't know I'll have to experiment but friend of mine showed me his Station Master he picked up decades ago (Phelps Dodge is the brand) and I love it, it's about 3"- 4" diameter, except it's only 20 ft long and that wouldn't be enough to house the full size GainMaster - so I'm going to have to build one of my own. - The idea is to make something strong enough, tough enough and stiff enough that it holds its shape atop a ponderosa pine at about 130 ft at the base. If I can figure out a way to get it filmed and uploaded then I'll do it!

This is very nice Mike!😀 I'd like to have the DX pole and build the antenna. Do you have a plan available? Does the factory built one have the wire inside aluminum tubing?

Hi Mike, great video, just one question if I may, I have standard RG58 but I also have some spare mini8, would it make much difference which one to use, Thanks for your time

Great video! Is this like the thunderbolt SSD?

Great antenna project. I have a question: how do you increase its continuous power handling? Let's say, 1000 watts. As far as I know, current gain master 5/8 is only 500 watts. Thanks.

Fantastic!!

Fantastic AAA

Huh... so you use your tape measure as a soldering clamp as well ...... 😎 Nice video again Mike.

Hello Mike firstly great videos, learn't so much from you and Hams like yourself who make these videos to help others. I hav a question regarding the "CHOKE", 66mm is the diameter the governing factor or the length. Basically I am asking can you use another former size if that is all you have to hand, so long as the length of coax in the coil is correct. Thanks very much, keep it up.

Have you ever used Heat Shrink TAPE before? Really handy when tubing become awkward. There is a "glue lined" version available as well.

Good one Mike 👍🏻 Guessing further +/- adjustment is via the length of the driven element if needed/desired?

Very good video. Im a new subscriber and the questions I have are, what size DX Commander pole are you using and what size coax are you using to go to your radio? As well how are you adjusting for SWR? Thanks!

hi Mike, a question about this gain master project. I notice that you used an rg 58 cable (with a speed factor of 66) if I use a messi paoloni hyperflex 5 cable (with a speed factor of 87), the length of the stub always remains 345 cm after the reel? always using rg 213 for the 9pf capacitor and impedance adapter.

Hello, regards from Costa Rica, central america, I have a question, what will be a good substitute for Westflex 103 coax? We don't have that type of coaxial cable available in Costa Rica, what do you recommend to make the matching stub? 73s! TI2GBB -Greg

Hi Mike did it tune up straight out of the box as they say or did you have to adjust the antenna?; Looks like I've got something to play with the weekend if it will work with 213 coax thanks for the great video 👍

Looking on your qrz you have a sirio gainmaster up how do these compare. ---- Update just seen this in your other videos

Tenho uma dúvida no stub você fecha curto solda a malha junto com o positivo...

Muito boa antena swr muito bom 👍

Very nice. Thank you.PY2JU

Hi Mike. Made this antenna but made the top section out of a piece of wire. Just wondering if the top section could be made different lengths to suit other frequencies and bands ?

Nice job, mate! Well done and can I borrow it? 😁 😉

Hi Mike to move it it a bit down on the 27 mhz band would you lengthen the stub or the driven element? Great job!

hello the coaxial cable you used, is it at 50 ohm with speed 0,66 or 0,70? because there are gain master projects with slightly different sizes thank you very much

So the base of the antenna is where the coil is? I wonder how well it would perform higher up. Cool video 👌

Is it possible to only use RG-58 to build this antenna since we don't have that other cable you used for the matching stub? Thank you.

Hi Mike,what the difference from rg213 and westflex 103 for the matching stub. Regards.

It's useful if you start such videos by showing the completed antenna, so we can see how it all goes together before starting on the details. And more commentary would also be appreciated.

in inches yes thanks!!!

Is there an antenna model for this? I'm curious of the radiation pattern Vs a standard EFHW 1/2 & 5/8 . Does it offer an improvement in performance, or is the design benefit the large bandwidth?

Hi Mike I have a question if you could only have four antennas for HF and these would be the last antennas you would ever get and never have an opportunity to get a different one which four antennas would you choose

Holle Mike, what size DX Comander pole did you use? I am entertaining the idea of getting a pole from Cal and building one of these for a portable work site antennas

Is it critical to use the quality Westflex coax? If its only a 75 ohm stub and not being transmitted through, is it that important ? It just means having to buy a 1m length, everything else I have ...Cheers Mike p.s Any chance of a 27/28 mhz slim Jim. Its something thats always fasinated me. I ve had sucess with 2m and 70 cm but always failed on 27/28.

I would try to "" refurbish my spare GAINMASTER"" with TEST WITH H155 and AIRCELL7 .. to take way more Watt..

Great job man. Thanks to share your skill.😉 I only didn't understand why you was not able to transmit on 27 MHz without cobra. Whats is a cobra?

very nice construction and detailed explanation. I don't understand.... , confusingly in the measurement: On the RG58 measure 218.5cm/86" down from the matching stubb, and at 15:35 you say 2.26meter to the top of the coil. what is the correct measurement?

Hello. With inspiration from your video, I want to build my own antenna. I don't have the opportunity to get Westflex 103, I only have RG213. Should the measurement on the stub still be 72 cm when I use RG213?

Hi Mike, does the matching stub have t be westflex 103 or can I use rg213?

Buenas noches muy buen, video!! Mi consulta es que en centro quedo en 27800 y quiero dejarla centrada en 28200. Donde debo acortarla?

Hola amigo, siguiendo las instrucciones al pie de la letra tengo una roe de 1,6 en 27.555.Si quiero bajarla tengo que ir cortando el adaptador de impedancia?. Un saludo

Westflex 103 is not available in the US. Would RF Davis Bury Flex work? Or what should one use?

hi newbie here , what whould happen if we lengthend the feed to floor level then put radials out . just a mad thought ,

Does it make any difference using westflex as a stub or is it ok to continue with rg58 as the stub.

Can i please ask how exactly are you shorting the westflex counterpoise

Ciao Mike, complimenti per il video davvero bello. Ti volevo chiedere se lo stubb va cortocircuitato perché nel video non sono riuscito a notarlo. Grazie 73

I tried this antenna using Rg 214 and the stub was made with Rg 213 . CB band perfect but at 28.500 mhz I had a 2.4:1 and a 3:1 up to 29.300 it got better at 29.600 at 1.3:1 . How can I tune the antenna for a better SWR on 10 meter? (((((((HELP)))))))

What is the difference between the westflex and the coax? Do not know where you can get westflex.

Excellent Mike because of my Dyslexia can you let me have a shopping list of cables used just ordered the bottle for coil looks absolutely amazing regards Adi G7MUY

Can I also use RG214 as I dont have westflex103 available?

Hi Mike. I may have misunderstood. Just re read it, 72 mm matching stub...not 75ohm Ive put my glasses on...ALL coax 50 ohms ???

Hi, i built this and put it on a fishing pole but the SWR is very high. The last two sections of the pole are carbon fibre could this be the problem.

hey Mike, very nice video. Is there a plan to rebuild a Imax 2000 ? That would be very interesting, because it works on 10,12 and 15m it´s a great DX Antenna but very expensive. And what about a Gainmaster for 15m or 20m ? 73´s from DH1KJ

Excellent video, I am going to make one of these and give it a whirl, I wonder if one could be made for 17m, what do you think

Iam curious how RG-400 coax would work ???

So, it is a Bazooka basically. Great video! It would be more manageable to use a choke (toroid) over the coax balun (1:1 current), and run it inside of the tube.

Hello Mike, great video please keep it up! I would like to recreate the antenna. I only have the problem that I cannot get the Westflex 103 here in Germany. Is there an alternative? Many thanks 73 + 55 others Skip: Satellite 4000 or 13AG267

How many meters are the DX Commander pole? I find a Commander on Ebay and it is 7meters.Is that okey?