You only have one VHF channel operating on channel 13. ALL of the rest of your stations, regardless of their display number, are UHF stations.
You do not need nor should you use a pre-amplifier, your local signals are already very, very strong and a pre-amp will only make things worse.
Getting the antenna, whichever one you finally picked, out of the attic and up in the air will likely be your best solution. Keep an eye for common items like trees and buildings that might be in the signal path and do your best to place the antenna so as to avoid those obstacles.
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