If it does not load - click on search page; or google air evac frequencies and this site will pop up. Click on it and it will show the Air Evac Wiki page with about eight radio freqs - both VHF and UHF.
New Air Evac Lifeteam bases usually use 151.505 or 158.400 for many months until they apply for a permanent license.
I just checked the FCC database and they don't have any pending applications.
The correct link for the wiki article is Air Evac Lifeteam (US Nationwide)