Start here:
http://www.antennaweb.org/aw/Address.aspxI found a stacked Bow Tie antenna that I was able to aim at the farthest transmitters that also received the closest transmitters 60 degrees away from the farthest. All of the HD transmitters are either SW or SE of me on UHF.
73
Bob
There are still VHF stations in some areas . A log-periodic and a rotator still make sense for terrestrial TV signals . A few phone calls to station engineers might yield some good info .