The middle frequency for channel 7 is 177 megahertz....public service radio is in the 155-164 mhz range....I still think that this is causing you the issues, but eventually, you'll find the culprit...also, just for grins, shut off and unplug your computer and see if the pixing stops...my computer will effect my WRGB channel 6 by a 20% SS drop if I don't sleep the laptop...just a thought....
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