“What is the impedance of the twin feed, was it a home brew, if so what are the specs. Howard N5WIO”

“Hi Peter, I am in the process of moving house so I cannot test and publish a 10m modification right now. Take a look at Juko's 30m mod, shown in the current pdf document on my website. It is similar to the mod required for 30m, but for 10m make the shorted stub only appx 2.5 meters along from the vertical section, not 5.5meters as Juko says. This will make a tuned stub for 28MHz instead of 10MHz. This is quite complicated to get exactly right and you will need an analyser to find the exact length needed but it should be about 2.2 to 2.5m in length and open at the end near to the vertical feeder just like the picture. You need to use 450 ohm twin to make the stub. I hope this helps. All the best,   Mike, G7FEK.”

“hi mike i built this antenna and was totally amazed at how it works. Ive had many a contact into the north states and canada in the past 2 weeks, and all on 80mts. i was woondering if you had the 10 metre`s mod available? if so could you send it to my private e-mail please.. many thanks Peter M6PAV”

“David, I use a 9m fibreglass fishing pole with the top section removed. For this test we used a 7m pole inserted into a metal pole at the base giving an extra 50cm of height.”

“Do you use a Spider beam pole, Mike? I put my version up on my SOTABeam pole when I first built it but it wasn't tall enough. I'm buying a FT101ZD so will need to use it with your antenna at chimney height and partnered with a 12 metre pole. I shall build the VK5JST analyser kit first. M0XLE and I haven't managed to get the antenna tuned correctly yet due to no analyser to hand. I'll get there. ”

“Andre, let me know how you get on with your build. My antenna is down at the moment due to a fractured pole.”

“I was thinking about adding a choke to the coax feed-line somewhere. Now I have the answer! Funnily, I was also wondering if the coax would function like a counterpoise :-)”

“I should add that a simple choke made from winding 22ft of the RG58 coax on a 4 inch PVC drainpipe was added near the radio end and about 50ft down the coax from the antenna. When using this antenna with such a simple counterpoise, this choke is essential to ensure that the RF return path is via the counterpoise and not via the radio!. Placing it about 50ft down the coax near the radio end allows the coax itself to contribute to the grounding effect by working like an additional counterpoise. This addition has also proved very effective with my own installation at home.”