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In the attic, you have multipath issues with signals bouncing around. I don't know that the antenna you have will help in that regard. I don't know much about that antenna at all, I should say.
If I were you, I'd do the following in this order:
1 - Remove the amp - you're too close to need it, from what I can tell.
2 - Mount it on a mast so you can adjust direction explicitly - that's a must, especially in an attic
3 - Aim it at 260 magnetic and tune from there, after rescanning for antenna channels on the TV. Note your signal strengths for each channel as you tune to find the sweet spot.
If that doesn't help, a more directional antenna may fit the bill, like an ANT-751 at least, or maybe better would be an HD7694p.
I'd keep the amp out of the mix, as an amp cannot make a bad signal good. It amplifies the existing signal, making everything stronger, meaning the good and the bad both.
You may need to do more to help clean up the signal, possibly with an attenuator and even an FM trap. But save that for later.
Good luck and let us know how it goes.
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