You can try in the attic. You'll be starting with a disadvantage though. I expect you'll need to keep the outdoor mounting option open.
Amplifiers are only able to overcome losses on the output side, cables, splitter & poor tuner noise figure. As teleview has already said, amplifiers do not and can not make a small antenna perform like a large antenna.
I'm not surprised that the ANT-751 is performing as you describe. It's a good antenna for strong signals but is definitely not a 'deep fringe' or weak signal option.
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