I logged the following STARCOM21 site while traveling on I55 from St. Louis to Cape Girardeau. This site is not listed in the RRDB.
Site: 3.25 NAC=140
Neighbor: BEE00.140-3.10 ; Chester
Neighbor: BEE00.140-3.16 ; Cora
Channel 0-1001: 857.2625 SCC VOICE DATA
Channel 0-1161: 858.2625 SCC VOICE DATA
Channel 0-1321: 859.2625 SCC
Channel 0-1481: 860.2625 CC
From FCC frequency search, it appears that this is located at Menard Correctional Center at Chester in Randolph County.
FCC Callsign WPLR422 (ILLINOIS, STATE OF)
www.radioreference.com
Maybe someone local to the area can confirm this information.