The input to 155.235 may be 150.805. This is from the FCC database for license KNEE239. Shows 155.235 & 150.805. I'll plug it in and see.
Upon lift off, Air Evac checks in with Colbert 911 with the flight plan. They then switch to the frequency of the on scene agency for landing coordination. Then, once they are back in the air, another contact is made to Colbert 911 with the particulars of the transport, including fuel info, number of souls on board, and destination.
The next Air-Evac station south of the Shoals is in Fayette, Alabama.
Jonathan