I do believe (and it's been a while since I was in an Air Care helicopter), they have a radio that is programed to the DC/Metro COG radio system (like fire apparatus in the DC/Metro COG) they can switch to whichever area they are in and then to the assigned incident channel for that county. Example: Air Care would switch to 4 Foxtrot for an incident they are on in Fairfax (4) on incident channel Foxtrot. As I said, I know at one time they had that radio, not sure about now.