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Attics Are Not a reception friendly environment and Never Will Be a reception friendly environment.
Start with a ,
www.antennacraft.net , HBU11K antenna in the attic , aimed at about 220 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.
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The Tv signals strengths are strong at your reception location.
A antenna system amplifier is not required.
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For 1 Tv connected use No splitter.
For 2 Tv's connected use a simple common 2 way splitter.
For 3 Tv's connected use a simple common 3 way splitter.
For 4 Tv's connected use a simple common 4 way splitter.
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If reception situation/problems 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 the peak of the roof in such a manner that reception is not , obstructed , impeded , blocked , by the attic , roof and building in the directions of reception.
The directions of reception at your location are , the main group of Tv stations to the South West , and other directions of reception to the , West , North West , North , South East.
As always , trees and tree leaves , plants and plant leaves , buildings and other obstructions have a Negative Effect on Broadcast Tv Reception.
Some and not all Negative Effects are.
Absorbing and Blocking Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice is to install the , HBU11K antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and building.