KMSB is a Fox-affiliated television station that is licensed to Tucson, Arizona. Owned by Sander Media, LLC and operated by Raycom Media through a shared services agreement with CBS affiliate KOLD-TV, it is a sister to MyNetworkTV affiliate KTTU. It broadcasts an ATSC digital signal on UHF channel 25 (remapped to virtual channel 11.1 via PSIP) from a transmitter located atop Mount Bigelow; as a result of the transmitter's location, residents in the northern part of Tucson, Oro Valley and Marana cannot receive adequate reception of the station.