Originally issued a construction permit under the call sign KGSS in 1936, [3] KELO signed on September 5, 1937, on 1200 kHz, under the ownership of the Sioux Falls Broadcasting Association, also the owner of KSOO.Both stations were affiliates of the NBC radio networks. [4] It moved to 1230 kHz in 1941 as a result of the NARBA agreement. KELO was sold to the …