Directional Tv receiving antennas are in fact Directional.
Tv transmitter towers are at fixed non moving locations.
Directional antennas receive the best when aimed at the source of the signal , the transmitting tower.
Tv antennas also receive to a lesser degree at , front angles , back angles , back , of the antenna.
Directional antennas receive the Least Amount of signal directly on the sides of the directional antenna.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Your reception location has -->Weak Signal Strength<-- Digital Tv stations/channels , your reception location.
That is why I recommended the Large Directional Antenna aimed at the Weak Signal Strength Tv stations.