TV Antenna Helper is a useful android app for finding OTA signals at your location. It works pretty good. I have used the free version at a couple of locations and it allows you to see a map with all signals in the area pointing to your location. There is also a compass tool for aiming.
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TV Antenna helper app – 07-07-2014,10:30 PMPortable Comtech 13', Winegard 10', SAMI 7.5', 3 39" Ku dishes one motorized. Scanning 30w-131w