40 format on the station that was established in 2009. KNOU changed their call letters to KNX-FM on December 21, 2021, to reflect the change. Emergency preparedness As KNX and competitor station KFI are local primary stations for the Los Angeles Emergency Alert System, they are responsible for activation of the EAS when hazardous weather alerts, disaster area declarations, and child abduction alerts are issued. Antennas The station's antenna array features a 494-foot main antenna. The original main antenna (circa 1936) was destroyed by vandals on September 14, 1965. An unused 365-foot tower was brought in from KFAC (now KWKW) and was used while the new main antenna was constructed. This antenna was formerly in what is now a residential area to the south of the main antenna. The 365-foot tower now serves as KNX's emergency antenna. It was later relocated when much of the site was dedicated as a park in Torrance; it is now north of the main antenna, within the park. Only one antenna is active at a time. An experiment in the late 1960s using both antennas in a directional setup during the daytime was abandoned. Electrical properties The 494-foot main antenna is 0.53λ, or 193.5 electrical degrees. It has an efficiency of 400.73 mV/m/kW at 1 km. This is much better than average for a Class A station's main antenna. The FCC's minimum efficiency requirement is 362.10 mV/m/kW at 1 km. The 365-foot emergency antenna is 0.40λ, or 145.5 electrical degrees. It has an efficiency of about 343 mV/m/kW at 1 km. This is much better than average for a Class A emergency antenna but is inadequate for the main antenna. Notable former on-air staff Pete Arbogast News and sports anchor. Longtime broadcaster for USC Trojans Football from 1989 to 1994 and since 2001. Bill Ballance Bob Barker Bob Crane (deceased) Michael Fitzmaurice (using the name Mike Kelly) Chet Huntley (special events) and news commentary Bill Keene legendary traffic reporter best known for nicknames of freeway interchanges. (Deceased) Knox Manning (newscaster) Gil Stratton longtime sportscaster who worked with KNXT and KNX on and off from 1954 to 1997. Jim Thornton News and traffic anchor. Also the off-screen voice of Wheel of Fortune since 2011. Larry Van Nuys Dave Zorn (deceased) Dick Helton Current on-air staff Jennifer York - morning traffic reporter Craig Figener - political news reporter Emily Valdez - general assignment news reporter Margaret