You have some strong local FM transmitters in the same direction. I wonder if they might be causing interference to TV reception?
http://www.fmfool.com/modeling/tmp/8...f/Radar-FM.png
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I added a Radio Shack RF interference filter too but no improvement.
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Was it an FM filter, or something else?
Is the coax from the antenna grounded with a grounding block connected to the house electrical system ground?
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he thinks it's probably trees
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That certainly is possible if it is getting worse; trees do grow.
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Given the mast height of a dish is only a couple of feet (although it's on a second story roof), would going up higher be our best bet?
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It might help if there are trees in the signal path.
Any tall buildings in the signal path?