WSHM-LD is the low-powered, CBS-affiliated television station for the Pioneer Valley of Western Massachusetts, USA. 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 affiliate WGGB-TV.