I'm not sure what antenna you are using but it could be RF coming down the out side of the caax, this is a problem I had with my Buddipole. Lots of clamp on rf chokes close to the feed fixed the problem also coiling the coax had the same effect.
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73 de Bill, (N7OQ)
RV: 2006 Outback 23RS
USAF Retired, God Bless our Troops
Licensed in 1978 ex N7AFX, DA1VW, KK6GR
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