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Here are my thoughts.
ANT751 a bit low on UHF Gain for an attic install. Should work outside fine.
C2V too low on VHF gain for the attic but OK for outdoors.
Flat wave might work outside but not in the attic.
You need extra gain in the attic to overcome losses and multipath. Adequate antennas include HBU 44 or HD 7694P.
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