from the state EMS webpage
Air Ambulance Communication
As of January 1, 2013, the Very High Frequency (VHF) for
communications between air ambulances and ground crews will move to
155.3475. This change was made due to the high volume of traffic on
the previous frequency. Additionally, the Alabama Forestry Commission
has designated an Ultra High Frequency (UHF) 453.750 for those
agencies with UHF radios to conduct Air Ambulance communications and
landing zone coordination.