I have done some research in the FCC database for Lifeflight in the Bozeman area. I'm coming up with the conclusion that they don't use radios for dispatching from their own dispatch center. Here in Bozeman I believe they get dispatched by Lifeflight's dispatch center typically but can also get paged using the county system. Then they speak directly to county dispatch via a county fire channel.
Before Reach shut down their base here, they would get dispatched via their dispatch center via radio. This frequency came up in the FCC database.