Our unit runs calls in the back country, rough washboard dirt roads. We have a dual head Kenwood with a built in intercom. It works awesome. If i'm talking to the driver and dispatch calls we can hear it.
We have it all here right now. Fire is on VHF, City PD is on 700, Sheriff is on UHF, County EMS is on 700, State police is on UHF, and city/county support services are on 800.