On October 29, 1946, Commercial Associates, Inc., filed with the Federal Communications Commission (FCC) to build a new radio station on 620 kHz in Sioux City.

[14] In 1984, Sentry embarked on a $200,000 rehabilitation of the transmission facility in Dakota City, adding modern-day equipment, preparing for potential AM stereo deployment, and also laying the groundwork for a possible power increase to 2,500 watts.

[18][19] After the enactment of the Telecommunications Act of 1996, which relaxed limits on radio station ownership, Chesterman and the Cardinal Communications cluster of KGLI and KWSL combined operations.

[21] By the end of the decade, KMNS had shifted to a full-on news/talk format, mostly relying on local news and syndicated national talk shows.

[22] Clear Channel, predecessor to iHeartMedia, acquired the Sioux City cluster from Radioworks (the former Chesterman Communications) for $12 million in 2000.