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Balun Designs

Brag Book

Finally got my Home Brew Skyloop in the air on Sunday.  It is, at it's highest point, 35 Feet.  I positioned the Balun per your instructions.  It works amazingly well.  When I first did a contact with a net on 80M I did not realize I was only powered to 40W but most of the stations reported 5/20 with great audio.  Thanks for your product and your help.  I will always recommed you to anyone who asks about a Balun.  (Used to be a Unidilla Fan)....

Thanks and 73's, John

Dear Bob:

This short note is to congratulate you on the “behavior” of your latest balun 1116di, which I find excellent. At this particular time I am surrounded by several tall buildings under construction, and you can imaging the electrical noise coming from gasoline engines of pumps, winches, and concrete mixers of all sorts in the surroundings, and coming from several buldings in a choir of sorts.

And I thought you might be interested in knowing something I found with the new balun: I very seldom get out from home because I find it very painful to walk,  So one of the things that entertains me is recording music, using an iMac computer and an exterior Samsung disc writer costing all of 30 dollars; and the recorded sound is excellent as the noise is eliminated by the Balun, especially in my case for I have a vertical coaxial cable measuring 150 feet from the top of my building to my apartment. I have the computer, plus an ICOM 7200, plus a 300 watts amplifier by Hy Tokyo (I hope it is written this way), and the balun cleans most of the interference…




Finally got the model 4932 unun installed that I purchased last year. I  wanted to let you know how happy I am with the quality and performance. The neighbors even like my "electronic birdhouse". What more can you ask for?
Thanks again, Cliff
birdhouse.jpg birdhouse2.jpg
 Thank you for your good service. I received the two 1116i isolation baluns two days after they were shipped.
 I installed one of the isolation baluns at the transceiver end of the antenna feed line from my HYEnd end fed antenna and I can can now actually use and type on my laptop while the radio is in transmit mode without the laptop cursor freezing and losing control of it.
  The second balun is destined for an antenna at my vacation home where I have the same computer problem while transmitting.
Thanks again!!
hi bob

thank you very much for the products that l purchased some time back.  the quality is the best l have seen . l could not resist temptation and removed the cover of one only ocf 4;1 balun, l was like an art critic looking over a canvas painting. more than l expected the quality and precision all exacting,  just perfect and yes all work perfectly.

thank you again bob, magnificent products.


Hi Bob, from Rob WA6** in Allen TX.   I finially located my unun in a good spot in my HOA yard thru a 36 ft tree in an inverted crooked L shape and worked Afganistan on 20 CW and made my first DX on 160 M .  This antenna is so quiet that I'm now hearing well into areas such as VU4KV tonight.  I'm having my brother and other friends purchasing your unun.  You made my day


For Winter Field day we used both the 4115 and the 4132. 
How sweet it was, the OCF needed NO tuner on 10,15,20 & 40. 80 was sweet from 3900 to 4000
And the vertical was very functional used a small manual tuner and only the inductance needed slight changing.
So , HUGE thank you very fine work on your product.
I only have a snowy picture because it snowed while we put the antennas up and everything was buried when we packed up the gear.winter-field-day.jpg
I am sending you a photo (its dark and a bit hard to see), You will see the 43 vertical that is doubling as a mast, there is a pulley at the top which we used to raise the OCF to 40 foot. Both antennas were literally touching. I used an antenna switch to use one or the other.
we did what we had to and can not wait to use the balun this summer


Eham Review of competing product

The biggest issue I have (with the U******) is the tendency of the core to saturate during longer operating sessions.

A friend is running his end fed with a Balun Designs 5KW 9:1 (Model # 9135) using the same configuration, wire gauge, counterpoise, etc I use. There is no comparison. The Balun Designs 9:1 absolutely blows away the U****** matching unit. Lower SWR across the bands, no saturation, and the core stays stable. I have ordered a 9135 but will keep the U****** unit as a back up.

The U****** is a good antenna for what it is. Comparing it to the Balun Designs unit is like comparing a BMW to a Ford. For those of us with restricted real estate, my advice would be to get your hands on a Balun Designs 9:1. It is significantly more expensive but it just plain WORKS. Keep your U****** for your back up, bug out bag, Field Day, etc


I use your UnUn 9130 for about 1 month in various locations in Chad with the following setup. Radio Kenwood TS-50 + MFJ-971 portable tuner + 7 meters of RG58 cable to connect the UnUn 9130. In some places I use only 12m of 1mm wire and on other location have used 26 meters, but I always been able to tune the antenna for a low SWR value. chad-balun-1-9-sm.jpg                       

The setup worked very well, especially with a good length or wire, I made QSO with all continents. Also worked Japan on 80m, VK, EU, USA on 40m.  

Pierre TT8AMO      


Hi Bob,
I just received the 4114ocf balun and was interested to see what was inside.  It's some of the nicest workmanship I've ever seem.  It loooks like mil-spec quality. I have no doubt it will work as expected on a 80-10 OCFD. Thank you so much for providing your services to us in the amateur community. 



I recently purchased two Model 16132 UNUN’s (32 to 50 Ohms).  I have installed each UNUN on “home brew” 40 meter band 1/4 wavelength verticals, 1) a portable ARRL Field Day antenna with three insulated radials and 2) a fixed station vertical antenna with four insulated radials.  Both UNUN’s replaced DX Engineering 1:1 baluns.  When installed and tested, the Balun Designs UNUN’s have greatly improved the performance of both antennas with lower VSWR and wider bandwidth.  Your balun and UNUN engineering design and quality production is outstanding!

// Bill



I want to thank you for having such a quality product.  I was speaking to a ham on the air a few months ago - he said that your 9:1 unun had really
changed the ability for him to throw out a good signal.  I've already ordered (and installed) one for myself, one for a friend, referred a friend
(who purchased) and am about to today order another one to help yet another buddy of mine install a decent end-fed wire.

The ability to eliminate a mismatched run of coax - with all of the negative consequences involved - means that QRP work will be happening more
often now.  I ended up installing one at my mother's house, as I'm spending more time with her as she ages - and the 175 foot run of wire at 20 feet on the low end and 100 feet on the high end means that I can work literally anything that I can hear.  (of course, it doesn't hurt to have 1/2 mile of
barbed wire fence directly under the feedpoint as a great counterpoise!)

At any rate, you'll be seeing more orders coming out of the Memphis, Tennessee metropolitan area as I educate folks on how to avoid the fallacy
of their rigs' built in 'antenna tuner' making them think that all is well.

Take care and have a blessed Thanksgiving.

- Matt


Hi Bob,
i want to let you know i received my order -  QRP 4:1 unun  - arrived today. thank you for such good service and a quality product. your workmanship is outstanding and i'm sure it will perform as advertised. that compliment is coming from a custom cabinet maker! thank you again,




Just wanted to drop you a quick note about the balun I purchased.  As I said on the phone, I have learned that you get what you pay for!  Thank you for a super quality product.  My SWR’s on 20, 40 and 80m are all 1.3 to 1 or lower.  My receive is so much quieter and I’ve hammered this thing with legal limit all weekend and worked the world with no issues what so ever!  This balun does not saturate!!  A quality product made with pride in the USA.  I assure you I have become an unofficial salesman for Balun Designs!   Thanks again Bob, I will be making future purchases from you this fall when I put some more wire in the air!!   




Got my balun Friday, but didn’t get it installed until yesterday afternoon. It is used with a new Cobra antenna - 140 ft long and they suggest at 4:1 balun. I have been using this antenna with my Flex 1500 and a couple of more traditional rigs. The balun I had been using was a 4:1 that I acquired a long time ago and probably didn’t spend much money on it.
So far this combination seemed to be working OK, except that I noticed that a local broadcast station I listen too was about S-7 instead of 10-15 over 9 that I had with the previous antenna (a G5RV, no balun). A friend of mine who has the perfect station, all coax lines are dressed at right angles, and there is no clutter in his shack, suggested your balun.
Last night, after getting your balun installed, I noticed that the receive on every band was better. I was even copying a YI1 on 30 meter JT65.  What was really cool was that today when I tuned in the broadcast station instead of being S-7 with the Cobra and my old balun, it is now 20 over.

They lesson here is get the real deal, not some cheap look-a-like.

Thanks for building great products.

Old Hal