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@John Candle - The antenna itself is on a mast 6 feet above the roof. The RG6 runs through a hole into the attic and then downstairs. The roof is typical asphault shingle. I checked the cable and the shielding does not appear anywhere near the conductor.
@GroundUrMast - There's no chance water got to it. It's too high for the sprinklers and we haven't had rain here in months. The transformer is new (it came with the antenna) but I can get a cheap one and swap them out for the test. Thanks for the idea of not restringing the cable! I don't know why that didn't occur to me. Here in Texas the attic only cools below 100 degrees a few days in January and I don't want to wait that long for TV.
@MisterMe - I like the survey idea. The downside is that this is an intermittent problem. Last night, for instance, everything was working peachy. Not a glitch on any channel. Any chance a HAM radio operator could be on a frequency (or frequencies) that might be interfering with my reception when s/he's broadcasting?
Any additional input would be greatly appreciated. I'll keep you posted on swapping the transformer and cable (which I presume could have an intermittent short), which I'm hoping to do this weekend.
Thanks to everyone for their insights.
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