All,
As has been pointed out in the past by myself and the director of MIEMSS Communications rberg001.
44.74, 7Air60 and the SYSCOM talkgroup 7640 are all patched together, so whatever is heard on one, its rebroadcast on the others. Private's are allowed on 44.740 and 7Air60 as there are agreements in place to use those frequencies.
As for 47.66, 7Air67 and the Heli-Med talkgroup, I cannot answer if those are patched or not, they were not when I worked there, I seem to remember there was another Heli-Med but I cant remember the talkgroup ID or anything else about that talkgroup as it has been 5 or more years since I worked for MIEMSS or programmed any radios for MIEMSS.
Nate