Hard to say, so I won't speculate, but I will say that solid RF knowledge is surprisingly thin in the sound community. Here are a new set of frequencies from 518-554:
Frequency TV
Channel
525.325 23
527.375 23
544.650 26
522.400 22
518.375 22
537.375 25
551.100 27
520.600 22
522.300 22
518.150 22
550.525 27
538.375 25
534.025 24
550.200 27
528.050 23
Here's another set if that has issues:
Frequency TV
Channel
552.925 27
522.025 22
543.775 26
540.100 25
518.550 22
540.975 25
532.225 24
528.250 23
539.900 25
524.675 23
548.425 27
537.850 25
520.475 22
521.450 22
549.150 27
By the way, these frequencies do not take into account local TV stations, but looking at the FCC data for your county (best data I had for you), there wan't much around...the closest transmitter was 30 mi at low
power so I figure if you're inside you'll be okay. If any of your receivers indicate received signal with all transmitters off, let me know and we'll avoid that
channel.