William Taylor wrote:

http://www.hamuniverse.com/supernvis.html

The claim is that a dipole 7 feet off the ground has
a 10db gain over a G5RV at 50 feet.

Is that possible, or hype?

It's could be true for 30m or 10m. Certainly not true
for the bands for which the G5RV was originally
intended namely 80m, 40m, and 20m. 12m comes as a
bonus.

You can make a G5RV just about as good as a dipole
on all HF bands.
0'-16' 20'
xmtr---coax---+---LLLS---+---450 ohm LL---+-102' dipole

The key is the LLLS, ladder-line length selector that
allows selection of 0'-16' in increments of one foot.
It requires four 4PDT relays, like the Omron LY4.
The relays are controlled from the operating position
but auto-switching would be easy to implement with a
directional coupler and a couple of op-amps. The
largest loop of ladder-line is only 2.5' in diameter.
--
73, Cecil http://www.qsl.net/w5dxp

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