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Of all the signals on your report, KFMB and KGTV should be the most reliable. If I was starting from scratch, I would have selected an antenna with greater UHF gain than the HBU-33. An Antennas Direct 91XG or DB8E would be my choice for going after the UHF group SSE of your location. An Antennacraft Y5713 pointed due south would be my choice for the two signals on real CH-8 & 10... Though the HBU-33 could be used instead. I'd also opt for a mast mounted preamp such as the RCA TVPRAMP1R.
So, to deal with the situation at hand;
How hot does your attic get? A slowly cooked amplifier is a possible explanation for the symptoms.
Have you considered a new matching transformer and coax? If any water has entered, these parts are capable of degraded operation, with symptoms that would be consistent with your description.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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