Actual signal powers from the nearby UHF stations will be anywhere from 10-25 dB below the power predicted due to the receiving location being well below the main lobe of the UHF transmitting antennas. VHF channels and FM will be much closer to predicted levels as they use lower gain antennas with more signal directed towards the ground in the near area. Keep in mind that TVFool does not use any data (if it was even available) regarding the vertical transmitting pattern as most of that data is not in the FCC database.
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You are right, WSOC is very close by. Signal is so strong it pixelates at times
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Add a small amount of attenuation at the input to your amp. You'll have to balance the strong signals with the weak, you likely won't be able to balance it perfectly as the power differential between the strong and weak is too great.