I live in east Montgomery county not far from the Macon county line. I hear the Haynes LF dispatch/helicopter traffic on 155.295 (listed as Rescue Squad in Montgomery county, but I've never heard anyone but Haynes LF). Once LF gets near the scene they'll talk directly to the VFD involved on the VFD channel. I hear them talk to the Macon VFDs on 453.100 (Macon Co VFD), 151.160 (Shorter Fire), and 158.775 (Franklin Fire). Most traffic is on 453.100 or 151.160 when involved with a TA on I-85.
When dispatched to Elmore, Tallapoosa, Autauga, Lowndes, Montgomery or Bullock counties the dispatcher will tell them to contact the ground units on the frequency of the VFD involved. That's where I normally hear the air/ground traffic.
You probably know most of this, but here it is in case you don't.