----- Original Message -----

From: Tom Conally

To: topband-helical@...

Sent: Sunday, November 11, 2007 9:49 PM

Subject: [topband-helical] new antenna operational

I finished my helically wound windom antenna and worked Cuba(5x8
report) today on 20 meters ssb with 100 watts. The antenna is an 80-20
off center feed with a 9-1 ferrite toroid balun (a kit) into 50 ohm
coax and an air core 1-1 choke balun. It is wound on 1.5 inch pvc
conduit which is laying on a privacy fence support about 5 feet off
the ground. The length of the conduit is 20 feet total with a total
wire length of 137 feet. There is very little local interference. My
IC 738 tuner tunes it to 1-1 swr on everything up through 160. I am
very pleased for it is a stealth antenna in my small private courtyard
(townhouse). I used a MFJ 204b antenna bridge to determine the
impedance--- about 450 ohms therefore the 9-1 balun.
I am going to write construction article with pics.

This antenna was completely experimental as I could find no info on it
except to combine windom info with slinky antenna info. Thank goodness
it worked out!

73
NC4TC