I completed the test with a "good" cable directly to the transformer on the antenna and then to the TV on the other end. The reception on the poor channels was definitely improved. They are still not as strong as the "good" channels; but they appear stable at about 25dB. No improvement on the "good" channels. Do they ever get any better than about 30-32dB?
So, if you think the antenna is sufficient, I guess I must test the rest of the system piece by piece until I find the weak link.
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