Try this two frequencies the first one for Eagle Med is 123.0250 mainly used in OKC but they may be using it or they use 122.8500 in Tulsa that would be where I would start, I know you are far from these areas however its a good starting point. Hope this helps out some.
I was told by someone in the buisness that Eaglemed uses SAT phones for dispatch etc. For LZs and hospitals that will depend on each hospital and agency. Happy scanning...