rethought this message and deleted it:
Davenport and Scott County are totally on RACOM, rural fire are paged on the old 154,220. State Police is still VHF analog, DOT is P25 conventional. Rock Island County is on RACOM except for Rock Island Sheriff and analog rural fire, Illinois State Police & DOT is on Starcom21,
That said, you can hear Milan PD on 154.815 as it is linked from Racom as is Bettendorf Police (460.45) and Fire (155.805). the last two may be taken down at times. Not sure if Silvis or Hampton police are linked back to VHF.
Rock Island Arsenal has their own system that is encrypted except for the machine shops and the utilities contractor.
If you have the capability Davenport Public Works, Citibus and Schools are on a mototrbo 450 MHz trunked system.