What I found, (purely by accident) is occasionally on sub-channels (ie:4-3) I pick up two different stations sharing the same frequency. I recently re-loaded the channels and now have two 4-3, 20-2, etc. I was initially puzzled because I would occasionally get a fuzzy image for a few seconds before I reloaded. I don't know if you have a signal strength meter in your setup. In my MH, I have an old TV that requires a "box" to get OTA signals. It has a signal strength meter and I can adjust the antenna to the strongest signal and avoid "ghosts" from more distant stations. My home system has a broader antenna pattern so I do get duplicates from different stations. Can't complain because at home I get 68 channels with some of the same channels from different stations.
