Sam,
If it is the Rayzar Z1 model, then it is tunable, i.e. can be rotated for improved reception. Some Rayzar models are omni-directional and not able to rotate, but the Z1 can be turned to point in the direction of the predominant signals.
However, I think your basic problem is simply that the stations are distant. 44-50 miles is a hefty distance for most tv stations in anything but very flat terrain. Especially if the broadcast station is somewhat low power or its antenna not so tall as others. Plus your receiving antenna height is relatively low (11-13 ft?) and likely obstructed a bit by nearby rigs, trees, and maybe even your own rooftop equipment.
Rayzar Z1 operating instructions: http://www.winegard.com/help/images/2/2c/2452370.pdf
