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Those signal levels shouldn't be overloading the preamp. It is either defective, or there is a bad connection somewhere. Is the system grounded properly? If not, it may have caused the preamp to fail prematurely. I would test the preamp injector/power supply right before the TV & see if it worsens reception to determine if it is in fact defective.
If you do need to purchase a new preamp, my suggestion would be the Winegard 8700, but I would re-check all the connections one more time as well before spending any money.
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