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I noticed today that channel 9 was still out, and that there is still 3" of snow on the roof. When into the attic to take a look. It turns out that part of the LOS of the antenna is through the roof. That expains it (and also why some channels cut out when it's raining).
I tried the easiest thing first. I moved the antenna about 3 feet, so that its whole profile was looking through the wall and not the roof. Channel 9 came in instantly and stayed for the hour I had the TV on.
Tonight it's a different story. Channel 9 was there when I put the TV on but then dropped out after about 15 minutes, and with it Channel 7 also dropped out.
So I need to try a few more spots in the attic. But it's likely that I will either have to put it outside or get an antenna with more gain.
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