A few questions:
What make and model television and, if used, which DTV converter are you using?
Are you currently receiving any digital signals?
What direction is your antenna pointing?
I believe that CKVR is now broadcasting in digital format based on rabbitears.info and a brief look at "OTA Reception Results" at
www.digitalhome.ca
I get the impression you are using an analog only TV. If that's not the case, please pardon my assumption.