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Just to close this out... I moved the antenna a few feet so that it wasn't point through the roof, and now I'm getting >95% signal strength on all channels. The installer was surprised that this made such a difference (he said he's done dozens and never seen an issue). I suppose the presence of radiant barrier (which is all over my house, including the roof) attenuated the signal more than what might be "normal."
Thanks again to everyone here for your guidance.
EG
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