'GBH (Great Blue EXperimental) 44, WGBX-TV, is a full service television station broadcasting to Boston, Massachusetts on local digital UHF 43. It is a sister channel to WGBH-TV, an affiliate Public Broadcasting Service. . WGBH uses GBH to air experimental shows before putting them on the more established WGBH, including
imported shows from Great Britain like Dr Who.