Roger:

Somewhere I believe I read that you have a good ground plane under the
tower, but consider an alternative: I have a 100' tower which has numerous
VHF antennas and a couple of HF dipoles hanging off of it. Tip elevation is
130' AGL. I added 4 elevated radials at 10' and brought all the feedlines
out below that level. I am sure that the dipoles must add some capacitance
loading, but with a gamma match and tuner at the antenna, I get 170 kHz
usable bandwidth (SWR2:1) on 160 meters without retuning.

--
Crazy George
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"Roger Halstead" wrote in message
...
I've played a bit with inverted Ls, but I'm going to try one on a 100
foot tower with a TH5 at 100 feet, 28'8" 6-meter yagi at 115 feet and
the UHF and VHF arrays at 130 feet.

By my calculations the tower should be close to a half wave, or
slightly shorter than a half wave.

I know that some tower heights and antennas can pose a problem such as
the 70 feet and a tribander listed in the handbook.

This antenna will be about 80 to 90 feet vertical and the rest
horizontal.

Has any one out there tried anything close to this?

Roger Halstead (K8RI EN73 & ARRL Life Member)
www.rogerhalstead.com
N833R World's oldest Debonair? (S# CD-2)