I'm in central NJ and getting ch 39 WLVT (OTA) out of Allentown (Bethlehem) at RF 62. There's the main digital channel, 39-1, then 2 subchannels, 39-3 and 39-4. I'm getting all three at the same signal strength but I only get programming on the first two. When I tune to 39-4, I get the "no...