If it is MED channels, the hospital xmit's on 463.#### and the EMS xmit's on 468.####. The higher your antenna, the better chance you will have receiving it.
I recall when I was a paramedic, we NEVER gave out the patient's name over the air. i.e. "Enroute with a 56 y/o male, complaining of chest pains, etc., etc., etc." Plain and to the chase. Funny thing is that a paramedic could not state that a person had an open fracture with the bone protruding, but we had to say "POSSIBLE open fx, bone protruding". Even funnier, once you put a patient in your ambulance, by state law, the patient COULD NOT die! You could pronounce the patient 48 (our code for DOA) on the scene, or the docs could say 48 in the hospital, but once in your truck, you had to work ALS until the doc said to stop and he coded them. Silly, but true!