Bob,
I have two Force 12 Sigma (Magnum 160VX) verticals phased in the back yard.
After asking the question about grounds for verticals; the overwhelming
response was to go with as many ground radials as possible.
I ended up putting down between 100 and 120 1/4 radials under each vertical
(not a one afternoon project). This seems to be the best answer. I
beleive the ground at my qth is about the same as yours, and the things seem
to play fairly well (transmit). They don't receive worth a damn though;
lots of qrn, etc etc etc.
Good luck
K8ZTT Dick
Franktown CO
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