[Texas Girl]

Help! I live west of Fort Worth Texas and suddenly lost one of my main channels (nbc 5) about 3 weeks ago. All the other channels come in great, but I get "weak or no signal" when I turn on 5. We have 2 antennas in the attic and an attenuator. I wrote to the station and they suggested we try to re-position our antenna, which we did to no avail. Why would we suddenly lose a channel, but all the other channels still come in strong? The station is being no help at all, and I am at a loss as to what to do. Thanks!