Bottom line is Canada was ahead of the curve and created protection zones around Canadian runways to limit antenna transmission power to a certain spec. Furthermore, they have exclusion zones that prohibit antenna installations within a specific area around the runway. They didn't do this in the US. Risk is very much mitigated due to these actions.

With 5G it's more the ground based equipment that presents a problem. But it's not so bad in Canada as the regulator has more say. In the US, it was a big deal, especially when the FAA Advisory Directive related to 5G first came out. AT&T and Verizon seem like they had more say in ground based antenna placement and power. Boeing has gone to great lengths to show that interference is minimal or non-existent in a lot of the airports listed in the AD.