This from Dave Weaver:

Chicago FD Transition From VHF Analog Radio System KSC711 To UHF Digital Radio System WPSG985 11/18/12 0800 Hours Recording
http://www.justin.tv/radioman911/b/341101867
Direct Links To Feeds:
Chicago Tower http://www.justin.tv/radioman911 (Incident Board)
DeKalb Tower http://www.justin.tv/dekalbfeed
Joliet Tower http://www.justin.tv/jolietfeed
Northwest Cook Co Trunked Feed http://www.justin.tv/stcharlesfeed
North Cook/DuPage Co Feed http://www.justin.tv/summitfeed
South Cook Co/NW IN Feed http://www.justin.tv/williamneumann
Dave Weaver