I will second the need for short radials if your soil is very poor. I
installed my K9AY system last fall after it sat new and unused in my shed
for a few years.
The first I noticed that it had very poor rejection of distant signals of
the back of the loops. I added the suggested radials, and noticed a small
improvement. The loops really started to work when I added a cheap CATV
ground rod at the end of each radial where the loop outer tie down pegs are
located. I tried adding four more radials, for a total of eight, but if
there was a difference after adding the additional four ground rods it was
not noticeable.
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