With the payments I seen, it would be beeter for each agency to get their own radio system. A agency self owned radio system insures smootheness of operation, over crowding, and each agency can have their own administrator, instead of answering to another agency. And what is to say that payemts could not go up. Payments that could have eventually owning your own radio system.
Plus, each agency owning their own radio system, they can taylor their own radi system to their own needs and importances. And security wise, it benefits the individual agency who owns and controls their own radio system.
As I understand , as long as a public safety agency, lets another agency use their radio frequencys, it is legal, SO Long as the prmary agency has enough mobiles/portables for licensure. Adding mobiles or portable to a license would seem beneficial to me. A single, department/agency radio system would also prevent over crowding, and over burden on the radio backbone itself.
Me. My opinion. A Kenwood or Vertex. Right of the top of my head - and with my "current" research , I would go with a Kenwood Communications radio system - AES capable, towers and all. The money as I seen, they could own their own radio system in a short time - Backbone system, software and hardware.
Security wise, a department / agency owned radio system is better.
FF - Medic !!!