Reading your first post, I thought, holy cow he has the same problem as I. Maybe he found a fix that I can duplicate. Then, I keep on reading until I go to the last post. Crap, I wish mine was that easy.
My setup is PreAmp Channel Master CM7777 UHF/VHF to Amp 8-Port Bi-Directional to TV. In late Fall, after the weather turned cold, I quit getting the weak signals, the two CBS channels. I tried a direct preamp to TV, it didn't help. It used to work since 2008. Now I'm missing NCAA games. This is my March Madness. I can't get on the roof because of snow and it's 25 degree colder than normal.
I may have a bad preamp..................Will take a look at it in the Spring..............whenever that will be.
Callsign Network Virtual Channel Band
Click on callsign for detail
Moderate Signal KAAL ABC 6-1 UHF
Moderate Signal KSMQ PBS 15-1 UHF
Moderate Signal KTTC NBC 10-1 Hi-V
Moderate Signal KXLT FOX 47-1 UHFWeak Signal KIMT CBS 3-1 UHF
Weak Signal WKBT CBS 8-1 Hi-V
Weak Signal KYIN PBS 24-1 UHF