Sheilded dedicated power line to your rig? I'm only guessing.
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Have you tried RF Stoppers (ferrite clamp) by Audioquest? These little magnet cylinders clamp onto your interconnect and block FM noise. Radio Shack also made a version. The Cable Company web site has the RF Stoppers for sale:
(Scroll down to "Miscellaneous" which is not quite halfway down the page.)