WSIU also operates full-time simulcast WUSI-TV (channel 16) in Olney, Illinois; from a transmitter on North Shipley Road (County Road 900 E) near Dundas, WUSI-TV serves the southeastern part of the state, including Olney and Effingham, and also covers Vincennes, Indiana. A digital replacement translator of WSIU-TV is located in Cape Girardeau, Missouri, on UHF channel 28. SIU also owns WSEC, based in Springfield, which leads a three-station network serving viewers in Springfield, Macomb, and Quincy.
