November 26, 1936 Black Hills Broadcasting began radio operations as KOBH (Kall Of the Black Hills) from the penthouse of the Alex Johnson Hotel 1943 Helen S. Duhamel purchased a minority interest in Black Hills Broadcasting.
January I, 1945 Received permission from Federal Communications Commission to increase its power to 5,000 watts and change its call letters to KOTA. KOTA became affiliated with the CBS Radio Network.
1948 Helen S. Duhamel expanded her holdings in Black Hills Broadcasting.
March I5, 1954 Helen Duhamel purchased all the remaining common stock in Black Hills Broadcasting and Duhamel Enterprises was formed with its only station being KOTA Radio.
August 1954 DBE filed with the FCC for Channel 3 in Rapid City.
December 8, 1954 FCC granted a Construction Permit for television station.
June 1, 1955 KOTA-TV began operations under program test authority.
July I, 1955 KOTA-TV (the second television station in the state of South Dakota) commenced commercial operation at studios located at 1819 West St. Joseph Street in Rapid City.
March 5, 1958 KDUH-TV (Channel 4) went on-air from studio in Hay Springs after debentures were sold to citizens of Gordon, Rushville, Merriman, Alliance, Chadron and Hay Springs, Nebraska.
November 11, 1966 KHSD-TV began operation as a satellite from Terry Peak on Channel 11.
October 1970 the KDUH-TV antenna was moved to a new 1965-foot tower southwest of Hemingford to provide Grade B coverage to all the Nebraska Panhandle, as well as parts of Colorado, Wyoming and South Dakota.
October 28, 1977 KSGW-TV began broadcasting on Channel 12 from the Big Hom Mountains.
April 1, 1976 Helen S. Duhamel resigned her position as President and General Manager. William F. Duhamel became President and General Manager.
February 2, 1982 KDUH-TV relocated its studios from Hay Springs to Scottsbluff after remodeling the First State Bank Building into a modem television studio.
September 24,2002 The 1965-foot tower at Hemingford, NE was dropped by outside contractors while strengthening tower in preparation for DTV equipment conversion. KDUH-TV, Channel 4, went dark; however, it continued to telecast on Translator K02NT and a cable feed.
December 2002 KOTA-DT began broadcasting as South Dakota's first full powered HDTV station; KDUH-DT in August 2005, KHSD-DT in July 2005 as full powered HDTV stations; KSGW-DT in September 2006 as full-powered DT station.
March 19, 2003 construction started on replacement tower erected at relocated site at Angora, NE and began telecasting September 12, 2003.