Use a Channel Master CM4228HD antenna aimed at about 250 degree magnetic compass direction.
As to the mounting location , you are are aware of advantages and disadvantages of different locations.
You know that the closer the trees are to the reception location the worse reception will be. The reception improves as the trees are more distant.
Reception improves when trees are avoided.
Reception improves if can get antenna higher then trees.
Reception improves if can aim under trees in such a way that the reception path is more clear.
As to attics , you know about the advantages and diadvantages of attics.
You will find a location that works.
The signal strengths are strong , a amplifier should not be required.
Here are some places to buy antennas and etc. .
www.solidsignal.com
www.amazon.com
www.channelmasterstore.com