Mark,Yes I will backup Viper 43.I have heard radio traffic on 155.160 along with 5040 and 65376 on Safe-t.I have Air-med helicopters flying over my house all the time going to the landing pad at St.V's.The hospital is 5 miles or less away from my location.I can tell which helicopter it is by the sound of rotorblades as they pass over.I have Lifeline, PHI (Angel 4) along with others that land and take off and fly over my home.