Interference parameters and protection only apply within grade A and grade B contours. If there is an issue within Canada, the US LPTV station will need to make changes to eliminate it. If the Canadian stations are outside the protected contours in Ft. Erie then it doesn't matter.
The FCC doesn't use TVfool.
Neither does IC. They use contour maps that are much less sophisticated than the algorithms used by TVFool. Due to local geography, there are areas here with reception that is significantly different than the FCC and CRTC contour maps.
Fort Erie is within Global Toronto contours.This would be new interference.The CHCH interference was a pre existing and accepted by CHCH.If you go by percentage of population than it would be within limits.Left as is pretty sure reception will be lost by many in both countries for RF 17.
8.1 Over-the-air television (OTA TV) broadcasting
40. OTA TV undertakings in the 600 MHz band are permitted to continue using their current channels and modes of operation (i.e. analog or digital) until the spectrum is needed for the deployment of mobile broadband services, as indicated in SLPB-004-15, Decision on Repurposing the 600 MHz Band. ISED will issue a displacement notification to these TV undertakings only if it is determined that the continued operation of these undertakings will prevent the deployment of new mobile services in the 600 MHz band.
41. For these TV undertakings, the following minimum notification periods apply:
regular power TV undertakings located in urban areas are afforded a minimum of a one-year notification period and
regular power TV undertakings located in all other areas are afforded a minimum of a two-year notification period
42. TV undertakings whose continued operation after their phase completion dates would impair mobile deployment in the U.S. have been notified by ISED that they will need to cease operation at their phase completion dates.
(partial quote only - see the link above for more info.)