I'm using a Terk TV38 UHF/VHF Large Directional Outdoor Antenna which
has a "pink" CEA color-code (which is more than what I should need).

The main-boom of the antenna is about 12 inches above a flat roof (I
can't raise the antenna hight because I live in a condo-development).

The main-boom of the antenna is horizontal and it is pointing to where
Mt. Wilson is (but I cannot see Mt. Wilson from my house because it's
45 miles away).