KMSB, virtual channel 11 (UHF digital channel 25), is a Fox-affiliated television station located in Tucson, Arizona, United States.. Owned by Tegna, Inc. and operated by Raycom Media through a shared services agreement with CBS affiliate KOLD-TV (channel 13), it is a sister to MyNetworkTV affiliate KTTU (channel 18) through a joint sales agreement with Tucker Operating Company. KMSB maintains transmitter facilities 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. It shares studios with KOLD-TV on North Business Park Drive on the northwest side of Tucson, near the Casas Adobes neighborhood.