Ok, the campsite is just south of Potsdam, NY: Higley Flow State Park. I've never brought my antenna there to see what channels I can pick up on TV. Ideally, I'd get CBC and everything would be fine, but I found the following coverage map on CBC's website:
The campground is due south of Cornwall, and according to this map, Cornwall doesn't even get coverage..? SSF? You live there, don't you?
I also found this OTA coverage map for the closest large town (Potsdam): https://nocable.org/availability-report/zip/13699-potsdam-ny
NBC's OTA seems to be non-existent in this area, which would've helped at least for the Sunday afternoon game.
Alternatively, I can either pay a bunch for a data plan and find a way to stream games, or I can abandon my family for hours at a time and find a bar showing the game.