George, Very interesting!! I have a station like yours. Omni
VI/opt3 and Hercules II with a very similar grounding
system. I'm getting ready to put up new antennas before
winter sets in. As an experiment I cut my 75m dipole back to
make it 3 half waves on 20m. I also have the W2DU
Balun up there. Didn't change anything else. Bingo, I have
RF on my 20m SSB signal. Switched over to the R5 vertical
and the problem was gone. I know this doesn't help with your
problem, but it may be food for thought.
GL es '73, Harry WA8HC
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