153.770 is a County wide fire frequency according to the database, it's likely on a repeater.153.770 must still used by many Ontario fire departments. St. Catharines probably moved due to the interference from Guelph. It's not unusual to hear Guelph dispatch calls to Arthur, Puslinch, Eramosa or Elora in Niagara North. Guelph must use 153.770 as a regional channel to trip the volunteer's pagers.
On a good night I can hear Buffalo Police and Fire.. even the NY State Police.. I am in Mississauga (10 minutes west of the Toronto city limits) - that being said, I have good antenna's up.. if I use a handheld I get nothing from Erie CO - But a ton of stuff from Niagara (NF City PD, NF Sheriff and Fire Dispatch)mciupa, If you can here them, try Buffalo Fire on the Dispatch 424.225 DCS 565 and Amherst Fire Control on 425.400. Let us know if you can hear that far.