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A Simple Reception Situation.
Attics and the Inside of Buildings Are Not a reception friendly location and Never Will Be a reception friendly location.
Yes you can install a ,
http://www.antennacraft.net.
HD850 antenna in the attic aimed at about 235 degree magnetic compass direction.
A antenna system amplifier is not required.
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If reception situations happen in the attic that are not resolvable with antenna aim adjustments and antenna location adjustments in the attic , then move the antenna to above the peak of the roof.