If you have an HD box you can find what frequency it's on by simply tuning to FOX HD, then turn off the box, go into diagnostics(Press OK/SELECT within a couple seconds of powering off the box) and look at current channel status, I think it's option 3 or 4. One of the lines on the screen will tell you the physical frequency it's on.
I didn't know of any areas that pushed past ch 120, I thought most if not all of this region was 750mhz gear, maybe they are testing higher frequencies? Upper 120s is pushing into 800mhz+. I know both Lower Bucks(Bensalem) and Mont Co(KoP) use analog Weatherscan local on ch 120 as sort of a "test" to see the PQ that much above 750mhz. It always looks great.