Research shows that.
The 20 degree magnetic compass direction is a in between aim direction.
WSPY ,
http://en.wikipedia.org/wiki/WSPY-CD.
WSPY , is at 341 degree magnetic compass direction.
And the main group of Tv stations is at 52 degree magnetic compass direction.
20 degree magnetic compass direction is a in between aim direction for reception of both directions locations.
As always, the starting antenna aim direction is the --> starting antenna aim direction.
Antenna aim direction can be adjusted for best reception.
Most Digital Tv's have a Signal Strength Meter and some Digital Tv's also have a signal Quality Meter.