Here is my experience with listening to Air Ambulance in the province.
150.1000mhz - Used by the helicopters to communicate with the CACC and land base ambulance crews while heading to the scene for specific landing directions and patient updates. Once departed scene they usually call the CACC in the area in which the trauma centre is located to give a patient report and arrange for a land crew to meet at the helipad if needed.
413.6875mhz- Output / 418.6875mhz Input - Used by the Helicopters to communicate with Medcom when on calls. This is a repeater pair and coverage is usually limited to Toronto and other Urban centres with a repeater. I can only hear this repeater when there is an inversion from Kitchener but I always hear the choppers on the input.
You will also hear the Choppers talking to the local ATC in the area which they are flying, they usually identify with "Canadian 77XX Medivac" with the XX being the numbers of the chopper like 792 or 799.
129.2750mhz AM - This is the Long Range frequency used by all the fixed wing planes to communicate with Medcom while on runs. I usually hear the planes telling Medcom their departure times and estimated landing time at their destination. Other than that it is very boring to listening to but you can usually hear the planes for 300-500kms.
I can record traffic on each frequency and post if people want to hear the traffic related to each frequency but I think I explained it pretty well.
Below is a good example of comms on 150.1000mhz between the CACC and the chopper. Plus it gives me the chance to show off receiving Niagara CACC from Kitchener.
