Do you know if these are the current freq for the region or not.I programmed 406.700 and 406.200 in my radio and heard nothing. I also programmed 410.800 and heard nothing.I programmed the ones you put but I have not heard nothing. I dont know if they work on the weekends or not.I got the top two from the Chicago page.
I don't know how often the security checks are conducted but they are usually done on or about the hour. I have monitored them at all time of the day or night. They also are particularly active when there are demonstrations going on in downtown Chicago and federal property could be involved. Can you search the lower 400 Mhz P25 frequencies? They may use a different UHF frequency in Peoria or other parts of the state. Good luck.