The station is owned by Robert and Luann Wilkins, through licensee Tucson Christian Radio, Inc. National religious leaders heard on KGMS include David Jeremiah, John MacArthur, Chuck Swindoll, Charles Stanley and Alistair Begg.

[2] Programming is simulcast on KNXN 1470 AM in Sierra Vista, Arizona, to provide coverage southeast of Tucson.

KGMS began as a request for a construction permit, filed in 1958 for a new station on 940 kHz in Tucson.

On September 1, 1977, it switched to Adult Contemporary music and changed its call letters to KMGX.

[4] On March 17, 1997, the Federal Communications Commission (FCC) announced that 88 stations had been given permission to move to newly available "Expanded Band" transmitting frequencies, ranging from 1610 to 1700 kHz.