We originally had a Glomex 10", decent reception. Upgraded to a 14" Glomex Nashira, slight improvement.
Since bigger is often better, in the world of antennas, I would have gone to a Shakespeare 19" BUT... the Glomex mounting system made one-for-one replacement easier, and an existing obstruction would have caused moving the TV antenna to a different location. Way too much work, for TV, for us.
FWIW, OTA TV reception is very much a function of receiver (your) location versus the transmitter location. In most cases, if you're in range at all, you'll get direct (no blockage) signals no matter the antenna, and then reception of diffracted signals will vary but only a little. You can use sites like TV Fool, and the FCC site, to see what's being broadcast where relative to where you are.