Since the Metro New York City area based private ambulance/ambulette service shakeout in the early nineties & the demise of CRB it's been pretty hard ascertaining any given frequency of these nationwide mega ambulance service conglomerates, the only survivor I'm aware of is Midwood who had a two Caddy fleet on Coney Island Avenue in Brooklyn, the only volley I believe who's actually gone from their side of the EMS fence is PVAC, some of the hospital based ambulances seem to have consolidated like New York Hospitals private contract "Empire State" & Columbia Presbyterian which I don't recall even having their own ambulances, I believe Booth Memorial is tied in with them in some kind of way. Is there any way you can record these transmissions & post them here or write down any hospitals they're transporting to along with dates & times? I know there are local buffs here who already know or can figure out who this is in like one day. Keep in touch.