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Yes start reception in the attic.
Aim a ,
www.antennacraft.net , HBU11K antenna at about 330 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 , do not trust a cell phone or tablet compass.
--->Many<---Digital Broadcast Tv Stations/Channels will be received.
A antenna system amplifier is Not required.
For 1 Tv connected use No splitter.
For 2 Tv's connected use a 2 way splitter.
For 3 Tv's connected use a 3 way splitter.
For 4 Tv's connected use a 4 way splitter.
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If reception situations.
Such as and not limited to Multi-Path -->Strong Multi-Path Tv Signals Bouncing All Around in the Attic due to the Strong Signal Strength Local Tv Transmissions , happen in the attic that are not resolvable with antenna aim and location adjustments in the attic then move the HBU11K antenna to above the roof in such a manner that reception is not , obstructed , impeded , blocked , by the roof and building in the directions of , North West , East , North East.
Yes put the antenna in the attic.
And Yes at some time in the future it is Ok to move the HBU11K antenna to above the roof.