A grand question I’ve been wondering myself. I saw Wings (HEART) are (were?) using 855.56250 and 857.13250 for “dispatch” / “new dispatch”, but on NFM instead of P25. Seems rather odd to use plain old NFM on 800 since UT is using P25 Phase II on TACN - I actually heard UT today for the first time. Wellmont is no more since it was acquired by Ballad Health as far as I know; the medevac crew flying for Wellmont was given the option to fly for Ballad or to take another job within Ballad. Wings / HEART tends to visit my home county relatively often so I’ll have to add the frequencies to my radio and listen up for them. When I do hear them it is usually on the FD and EMS frequencies inquiring about LZ and patient information prior to arrival. Last time I was at Holston Valley dispatch I was told it was all moving to Johnson City; they were using TACN at that time, but I didn’t inquire about the air ambulances. They had a very exotic CAD.
If I hear Wings / HEART I’ll follow up.