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I've noticed over the last month, poor signals on my local channels here in Phoenix. I get pixilation so bad I can't really watch the show. It seems to only be on the local network channels (CBS, NBC, ABC & FOX). Doesn't matter if I'm on 15 or 1015. Channels like HGTV, HIST, SCIFI don't seem to be affected. It starts every day around 11am and seems to stop around 6 or 7 in the evening. My suspicion is it is heat related but then what do I know. I just know my wife is not happy!