I am sorry forgot to mention that I do have a small DIY yagi antenna for VHF aimed at Toronto in the mix and is on the third input of my combiner.
It was working fine for years, showing 80+ signal strength, but now I get nothing.
Below is a basic diagram of my setup

UHF Antenna Buffalo ------

UHF Antenna Toronto ------ Combiner ---- CM777 Amp ------ Splitter ----- TV1
----- TV2
VHF Antenna Toronto ------

I built my Yagi back when CFTO went from the temp UHF channel back down to VHF channel 9, however long that is ago now.

Only thing I can think of now is, could the 300-75ohm matching transformer on my Yagi gone bad?


Update:
Antenna is fine, something must be causing interference. I hooked up an old Homeworx OTA box, was getting very garbled CFTO. Went up and down in the channels and I got CHCH and WiVB, perhaps I need a band pass filter, so only CFTO comes through on the Yagi.