I'm wondering if the RFI is primarily due to the condition of the coax? If a tuner is located at the rig-side of the coax, and the coax is at high SWR, it could possibly be a cause for coax radiation. A test might confirm that. Perhaps you could find a spot on 40m where the SWR is null, and no tuner is needed. If, at that point your RFI is significantly reduced, I would try feeding the antenna with twin-lead to a matching network located on the roof. That way, the coax would always be functioning as designed. In that case, a common mode choke at the load-end of the coax might also help to further reduce coax shield radiation. Something to consider. Hope you find the fix!! :-] N1BBR
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