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Most likely, the antenna needs to be moved, probably higher in the air, perhaps elsewhere. TV signals often don't follow our wishes for convenient or easily accessible mounting locations
You could go with a much larger, conventional-type antenna and it might be more directional and may work better if that's the only spot you have that you can use.
You're in a valley and are shadowed from the signals from the downtown area, so most of the signals are passing over your head with only diffracted (bent) signals reaching your rooftop. Such signals are usually much weaker and they tend to get scattered and/or layered by the time they get to your antenna. That's why it's important to both test reception and to be willing to try different locations and heights for the antenna.
That pre-amp doesn't raise any concern for overloading, it's fairly robust in that regard.
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