Remove the amp completely, it will hopelessly overload in that location. Reset your tuner by scanning with no antenna attached, then reconnect it and rescan.
If necessary, use the 42XG's tilt bracket to boresight the main boom of the antenna toward the peak of Monte Sano. You don't need a compass for Huntsville's stations.
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That will block all signal from the antenna.
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No, it wont block everything, it will turn into an attenuator of around 30 dB.
Your channel 3 is leaking in either from the local cable system or, more likely, from a nearby cable or satellite box's standard def RF modulator output which just happened to be tuned to TV Land (a cable-only channel) at the time you made your test.
Have you verified that the coax you're re-using is totally and completely unused by anything else in the house?