A:
50 miles may be pushing it for this antenna.
In any case, the higher you can mount it, the better. An unobstructed line to the transmitting towers is ideal. Trees are very effective at blocking the digital signals.
Cable quality has a huge impact on effectiveness of the antenna. This is more important when you get cable runs of 100 feet or more.
Is your booster mounted on the antenna? The booster is really an amplifier and must be as close to the antenna as possible. It can only amplify the signal it receives. As the signal travels further down the cable, it weakens. You want to amplify a strong signal (near the antenna) instead of a weak signal (near the television). Again, this is where good quality cable makes a difference.
If your television has a signal strength meter on it, use it. Have someone rotate the antenna while you monitor the signal strength on your television.