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Start with ANT751/R antenna in the attic aimed at about 245 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna.
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The signal strengths of the Local Digital Broadcast Tv stations/channels are Strong Signal Strength.
A antenna system amplifier is not required.
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Attics and the inside of buildings Are Not a reception friendly environment and Never Will Be a reception friendly environment.
If reception situations happen in the attic that are not resolvable with antenna aim and location adjustments in the attic.
Then move the ANT751 antenna to above the roof in such a manner that reception is not , obstructed , impeded , blocked , by the roof and building in the direction of reception , North West , West , South West.