Hogwire56,
They fly over my house in Gray quite often especially to and from Maine Med from Lewiston. If you plug in 453.65 PL103.5 you will hear the comms between Lifeflight and dispatch (Medcomm). Also, I would recommend listening to 155.325 which is what they use to contact Maine Med when inbound with a patient. Another good source is to listen to Portland Jetport Tower 120.9 as they instruct them when they are landing and taking off from Maine Med. Lastly, they often use Statewide Fire 154.31 when coming into an accident scene or landing zone to communicate directly with the fire/EMS personnel on the ground.
Hope this helps, happy listening!