IF the problem is with just one or a few GFIs you can install ferrite
clam shells over the fault leads and if that doesn't effect a cure
install the clam shells over the power leads feeding the circuit breaker
or GFI socket (which ever).
The main feed could be picking up enough RF to pass it through to the
GFI but more likely it's the actual house wiring that is acting as an
antenna. Installing .01mfd cap. across the hot to neutral lines at the
GFI sockets through the house may reduce the amount of RF floating on
the house wiring enough to resolve your RFI problem.
Insure your feedlines to all antennas are not responsible for bring RF
back into the operating position/ house.
Good Luck,
dave
wa3gin
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