I have a Winegard carryout satellite dish Doesn't seem to be the signal. I think it's the electricity. No scrambled looking picture at all. Goes from perfect to pitch black like I turned it off. Much better during the day, and bad later at night, but that's when I have the heater on. When I leave it off, intentionally, for a few hours, the tv is fine. It's an infrared heater, faced away from the tv but I wonder if that's doing something. I think it's def. worse when it's near the tv. But if it was about heat why would it do that during the day when the sun is beating down? Very mysterious. I was going to replace it (it's an old CRT tv, but I like it, it fits perfectly in the space) but maybe I'll wait to see what happens when I go to my new location in September.
