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The signal strengths are strong at your location.
Above the Peak of the Roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , West , North West , North , North East , East , South East.
Aim a ANT751 antenna at about 0 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.
A antenna system amplifier is not required.