I'll unplug the cable box and re-sniff. Thanks. I've had that problem a few times. It was just the end of a very long day.

If you have overground electricity, note where the transformers are. If they are old, they emit RF like crazy. When we used to do antenna systems they would manifest themselves by adding static to VH Low (ch's 2-6). Anyway, not sure what you could do about this other than prayer, calling the power company and removing the rf antenna.

When the transformers get so old they explode, so if you're in an older neighborhood, the power company doesn't mind knowing when they start to hum or buzz.

My worst problem rf homes are near rusty old power transformers on utility poles.