Thanks John. Since it seems that you do not think that the antenna itself is the problem, this transformer and the cabling to and from it are the first place to investigate. I have already tested the distribution system with and without the amp and its cabling and the results were the same for both TVs. I doubt that the cabling to both TVs have failed in the same way at the same time; so, I will not rewire the house unless I am convinced it is necessary.
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