It airs a conservative talk radio format and is owned by Crawford Broadcasting, with studios on South Parker Road in Aurora.
KLZ was first licensed as a broadcasting station on March 10, 1922, to the Reynolds Radio Company of Denver, Colorado.
The company's president, Dr. William D. "Doc" Reynolds Jr., had earlier experimented with radio broadcasts, and the station traditionally traces its founding to 1919[7][8] or 1920.
[9] In September 1915, Reynolds, then living in Minneapolis, was issued his first license for an amateur radio station with the call sign 9WH.
With the entrance of the United States into World War I in April 1917, all civilian radio stations were ordered to cease operations for the duration of the conflict.
Reynolds began work with the U.S. Forestry Service to evaluate the practicality of using radiotelephones to aid department communication.
He founded the Reynolds Radio Specialty Company, which was located at his home on South Prospect Street.
[15] (Reflecting this change, the Commerce Department's June 1921 amateur station call book entry for 9JE lists its new location as Denver, operated by the Reynolds Radio Specialty Co.)[16] After moving to Denver, Reynolds joined with other radio enthusiasts in making a number of "mobile" demonstrations, where radio-receiver equipped automobiles picked up special programs.
Initially, there were no formal restrictions about which radio station license categories could make broadcasts intended for the general public.
It embarked on a major restructuring of the broadcast band, and, on November 11, 1928, under the provisions of General Order 40, KLZ was assigned to operate on 560 kHz, which it has continued to use ever since.
KLZ was later able to take advantage of the adoption of higher limits, eventually increasing its power to 5,000 watts, its current rating.