In Canada it doesnt work that way. The CRTC has a list of cities that cable companies can use for US Nets and all are on Satellite (Via CANCOM). Detroit, Buffalo, Seattle and Spokane are the Big 4 cities. Rochester, NY Fox has been on the list for years. In fact in Thunder Bay they had to petition to the CRTC to be allowed to change from Detroit to Minneapolis for US Nets.
In Winnipeg as example they have
WCCO Minneapolis CBS
WDAZ Grand Forks ABC
PBS Grand Forks
KARE Mpls NBC
FOX Rochester, NY
Even if said stations can be picked up with an over the air antenna? Sounds like Soo Ontario kind of gets screwed.