Have you checked the FCC data under business? And there are like 3 standard freqs they use nationwide many times when they just get a base opened, and also use other bases nearby freqs.
I am 100 miles away they could be sharing as they do not have a site of their own yet.
Air Evac Lifeteam 72 - Waynesboro, TN 18 miles
Air Evac Lifeteam 94 - Savannah, TN 18 miles
Air Evac Lifeteam 37 - Waverly, TN 21 miles
Air Evac 143 Troy Tn shares Air Evac 31 Martin Tn Site for now.
Check 151.505 and 158.400. Those are the temporary frequencies used at new or moved bases.
There are no applications pending on their FRN for new locations.
Not sure buy I know that Parsons AE-141 is sharing Dispatch with Waynesboro AE-72 152.87000 D364
I have no listing for Waverly AE-37 I will dig around see what I can find.