If you're stuck with the antenna in the attic where the signal is poor, the best you can do is try to collect more signal with a larger antenna. An amplifier won't help. As a test you should mock up an outdoor installation with a clear view to the south and see what kind of results you get.
About the second TV not picking up as many channels. Can you simply trade locations and see if the poor performance follows the TV or stays with the location?
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