I suppose it's possible. Usually atmpospheric propogation allows Low to VHF frequencies duct or skip. The odd case of 400 mhz band. I have heard Rochester Police here in Brockville, Ontario they are on 400 mhz band. I have rarely heard a case of 800 mhz being heard the distance u are talking from Toronto, Ontario to Syracuse, NY. I suppose Lake Ontario being unobstructed to allow radio signals to bounce across. The Farthest I have picked up the Bell Tower Control channels in the east is Port Hope driving down the 401, and its very weak at that point. I have picked up control channels that walk right over other radio signals on a frequencies in the VHF band during skip conditions especially lately this summer. If you can log down all the information and try to extrapolate what u can from it to determine its origin. I have added control channels to my list that I have picked up, that I normally never here during normal conditions. Trying to determine where they come from is a tough task in some cases.