If you have an iPhone, TV Towers is the app I use. I have not had an android for about 4 years now, so unfortunately, I am not familiar with any good apps for that.
Rod
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We installed the Jack antenna adapter to our stock antenna, which improved our OTA reception an incredible amount! After having it, combining it with the free iPhone app on which direction to point the antenna it has worked amazing! I receive a ton more channels and better quality picture than with the factory installed Winegard OTA antenna. If you have the King Jack, then it has the signal meter built in and there is no need for the app.
mILcOP4523,
A friend of ours just purchased that and when we were camping together a couple weeks ago, and he did not have as good of signal and as many stations as we did with our Jack. If you purchase it, please let us know how it works for you, as maybe he has an issue or some malfunction with his.
Rod