I wonder if this could be backup transmitter in the event Starcom goes completely down. If the site looses connectivity or the site controller goes down StarCom goes into soft mode where a mobile can comminicate if his radio affiliates with a site. I’m not sure if a multi site simulcast system works the same as stand alone sites. In soft mode a stand alone site reverts to a single Repeater and you can only communicate with radios affiliated with that site. At least with a conventional 800 system you might be able to cover the whole city with mobiles on simplex or duplex with a mobile relay.
I don’t think Rockford has any VHF radios in their patrol cars (no vhf antennas on cars) and I don‘t remember seeing their officers with dual band APX portables.
Woke up to a bunch more hits (up to 394 now). Had the scanner on an indoor antenna for last nights weather event. Heard some of the traffic and it almost sounds like an automated voice message of some sort, longest signal was 33 seconds. 857.7625 is the only freq with hits. Back on the outdoor antenna now waiting to catch more. Couldn't hook up audio recording as the line out jack seems to be bad on the spare scanner.