KTTU, virtual channel 18 (UHF digital channel 19) is a MyNetworkTV-affiliated television station located in Tucson, Arizona, United States. Owned by Tucker Operating Co., LLC, the station is operated by Raycom Media through a shared services agreement, while its advertising sales are handled by Tegna, Inc. via a joint sales agreement. KTTU maintains transmitter facilities located atop Mount Bigelow. KTTU shares studios with sister stations Raycom-owned CBS affiliate KOLD-TV (channel 13) and Tegna-owned but Raycom-operated Fox affiliate KMSB (channel 11) on North Business Park Drive on the northwest side of Tucson, near the Casas Adobes neighborhood.