I'm having an odd issue. I have my TivoHD using OTA antenna and I get great signal, but when I watch the local CBS channel it begins to freeze and shudder. It will not allow me to do anyhting and i just have to wait it out, but on occasion it will freeze completely. I have tried a variable att. but it keeps doing it, I don't want to lower my signal too low to lose other channels, but even then it continues to do it. It is only on that channel and only since I changed antennas does it do it a lot. Before it would do it from time to time, but not as bad. It is still watchable, but is really annoying. I have avoided testing the HD since it is just on that channel. Is it possible that I need to filter something out to help?