Wikipedia
WSHM-LD is the low-powered, CBS- affiliated television station for the Pioneer Valley of Western Massachusetts. Licensed to Springfield, it broadcasts a high definition digital signal on UHF channel 21 (or virtual channel 3.5 via PSIP) from a transmitter on Ridge Road in Wilbraham. Owned by the Meredith Corporation, the station is sister to ABC/ Fox/ MyNetworkTV affiliate WGGB-TV. The two outlets share studios together on Liberty Street in Springfield.
Although considered a separate station in its own right, WSHM is actually operated as a semi-satellite of WFSB in Hartford/ New Haven, Connecticut. The most notable network programming differences between WSHM and WFSB include its airing of CBS This Morning Saturday (while WFSB does not), showing Face the Nation in its entirety, and broadcasting The Late Late Show with James Corden in its regular time slot (as opposed to WFSB which airs the program on a thirty-minute tape delay).
In terms of syndicated programing, WSHM airs The Dr. Oz Show weekdays at 5 p.m. (as compared with WFSB showing the program at 4 o'clock) while Comics Unleashed is exclusive to this station. In addition, WSHM airs separate commercials inserts and its own legal identifications. Master control and some internal operations are based within WFSB's studios on Capital Boulevard in Rocky Hill, Connecticut.