Here was the agreement from the County and City. This was taken off of the County's website
The County Commissioners and the City of Columbus have formed a consolidated countywide 800 MHz radio system, unifying public safety entities that previously operated on separate radio frequencies. The City is responsible for the radio infrastructure antenna, transmitters, etc.) for police and fire departments and other safety forces. The County oes the same for public service agencies like the County Engineer and the Emergency Management Agency.