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Attics and the inside of buildings Are Not a reception friendly environment and Never Will Be a reception friendly environment.
Install the HBU22 antenna in the attic aimed at about 73 degree magnetic compass direction.
Here is how to aim antennas ,
www.kyes.com/antenna/pointing/pointing.html
Use a Real and Actual magnetic compass to aim antenna.
If reception situations happen in the attic that not resolvable with antenna aim adjustments and antenna location adjustments in the attic then move the antenna to above the roof in such a manner that the roofs and buildings are not , obstructing , impeding , blocking , reception in all directions.
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Directional antennas such as and not limited to the HBU22 antenna receive the best in the forward direction.
A little less at front angles to the antenna.
Less at back angles to the antenna.
Less at the back of the antenna.
And receive the least amount of signal directly on the sides of the antenna.
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Attics and the inside of buildings are environments that have have electric and electronic noise.
Connecting the antenna and coax with a coax ground block to ground will direct some of the noise to ground.
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Rigided plastic pipe hanging down from the rafters is what I most often use for installing the antenna.
Is easy to drill holes through the plastic pipe to put a long screw/s through into a rafter.
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Most likely a antenna system amplifier will not be required.
A amplifier can make reception worse in a attic or inside of a building because the electric and electronic noise is amplified along with Tv signals.
And the Multi-Path Tv signals bouncing all around inside the attic and building are also amplified.