Category Archives: Counterpoise

K2AV’s folded counterpoise

Last winter I had twenty 1/4 wave radials at 1 meter above ground serving as counterpoise for my 1/4 wave inverted L-antenna for 160 meter, but after reading about the K2AV’s folded counterpoise I just had to try it out.

The vertical leg of the 1/4 wave inverted L-antenna for 160 meter is 21 meter high, and the bend is facing west. The feedpoint is 2 meters above ground, where I have mounted a Balun Design 1:1 FCP Isolation Transformer model 1142s/160m 2kW.

I use a 170 meter long RFA 1/2″ low loss coax from my radio shack to the antenna, and with 100W from my ICOM IC-7100 I have about 90 watts into the antenna feedpoint.

Living down in a deep and narrow valley surrounded by high mountains, I am pleasantly surprised by the very good coverage of this 1/4 wave inverted L-antenna for 160 meter, and this morning I was ready to give the new antenna design and the K2AV’s folded counterpoise a try.

Does it work?

Yes, without a doubt and the first DX station that answered my CQ DX call on 160m was Chuck NN2L giving me 559, and with my 90W into the antenna feedpoint that is a damn good report.

I’m really looking forward to see what this antenna is capable of, now as the cold and dark winter season is here.

The antenna feedpoint, and the Balun Design 1:1 FCP Isolation Transformer model 1142s/160m 2kW. I have a bleed resistor going from the FCP, and the driven element to a ground wire and a ground rod.

Lightweight PVC-tube as spacers, on both sides of the center pole.

From the feedpoint the vertical leg runs up 21 meter, and the bend is facing west. The horisontal leg is about 19 meter long. The feedpoint is 2 meters above ground

First look at the SWR measurement. Not bad at all!

Nice curve!

“Little Pistol,” can also achieve great results, even on 160 Meter. #1 in Norway, #11 in Europe and #14 in World, with only 90W into the antenna feedpoint.

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