Radio KNX-AM (Knx 1070 newsradio)

KNX (1070 kHz) is an all-news radio station in Los Angeles, California, USA. The station operates on a clear channel and is owned by CBS Radio. KNX broadcasts from facilities shared with sister stations KFWB, KCBS-FM, KTWV, and KAMP on Los Angeles' Miracle Mile. It maintains its transmitter and antenna array site at Columbia Park in Torrance northeast of the intersection of Hawthorne Boulevard and 190th Street. The station also broadcasts a high-definition HD Radio signal, streams online through its web site, and simulcasts on the FM band on the HD2 channel of KTWV (94.7 MHz).

KNX began broadcasting under the callsign 6ADZ on September 20, 1920. By 1922, the station was in competition with many other stations in the area, all sharing a single wavelength of 360 meters (at roughly 833 kHz). At the time, the AM broadcast band had not yet been defined, and stations were required to share frequencies. The station officially became KNX on May 4, 1922.

In 1929, the station's transmitter was upgraded to 5,000 watts, and in 1932, was raised to 10,000 watts of power. During this time, the station changed owners and was then operated by the Western Broadcast Company. In 1933, the station moved its studios to another part of Hollywood, and was granted permission by the FCC to raise its output to 25,000 watts. The following year, KNX's transmitting power was raised to 50,000 watts, which the station continues presently.

CBS radio began operating on KNX in 1936. In 1938, the CBS Columbia Square studios were dedicated for KNX as well as West Coast operations for the entire CBS radio network; that October, the station carried Orson Welles' infamous version of The War of the Worlds (which KNX has aired every October 30 since). Several legendary performers from the Golden Age of American network radio broadcast from there, including Jack Benny, Bing Crosby, George Burns, Edgar Bergen, and during the early 1960s, actor Bob Crane.

KNX became an all-news station in the spring of 1968 ; its first major breaking news coverage was of the assassination of Democratic Presidential candidate Robert F. Kennedy, in the Ambassador Hotel in Los Angeles, in June of that year.

In August 2005, KNX moved out of Columbia Square after 67 years of operations there, and began broadcasting from new studios on Wilshire Boulevard in an area known as the Miracle Mile.

In 2009 KNX adopted the slogan "All News, All the Time" for its promotions and advertising. It was previously used for 40 years by KFWB, KNX's historic rival in the news radio wars before both became sister stations in the 1995 merger of Westinghouse Electric (KFWB's owner) and CBS. KFWB's format change to news-talk in September 2009 now leaves KNX the only all-news outlet in the Los Angeles area, which is now emphasized in its alternate slogan, "L.A.'s only all-news radio station". A slight variation, "Southern California's only all-news radio station", is played at :30 past each hour before the news headlines.