About 10 years ago Oklahoma City lost every frequency above channel 30, but it was intermittant. We were lucky to have an RC'er who was also a tech at a local TV station. He brought his rig out and found out that the local ABC affilate had gone "digital" and hadn't completed all the tests. They were ILLEGALLY bleeding over into 72 MHZ and above. Funny the problem went away then next day.

I suggest you ask your local TV station for some help and see if they can see a different problem