The source of the RFI need not be in your immediate neighborhood. I had the
local power company out here twice to track down an s9+ noise that was
across my entire HF received spectrum. The first time they gave up after
about 1 hour. I called back and persuaded them to come back.
This time they sent their RFI specialist. He found it in about 4 hours. A 4
inch long blue arcing at the nearby power sub-station. Which I could have
seen it....anyway we called me on his cell phone from the sub-station and
temporarily squelched out the arcing...my noise went down to s1.... then he
allowed the arcing to resume and back it went to s9+
The sub-station was a full 3 miles away........
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