KRTH (101.1 FM, "K-Earth 101") is a commercial radio station that is licensed to Los Angeles, California, United States and serves the Greater Los Angeles area. The station is owned by Audacy, Inc. and broadcasts a classic hits format. KRTH's studios are located on Wilshire Boulevard in the Miracle Mile district of Los Angeles. The station's signal covers an extremely large area of Southern California due in part to its antenna location on Mt. Wilson. It can be heard as far south as San Diego, as far east as Moreno Valley, as far west as Santa Barbara, and as far north as Barstow. KRTH is the flagship station for the nationally syndicated program Rewind with Gary Bryan. KRTH broadcasts in the HD Radio (hybrid) format. History Early years In May 1940, the Federal Communications Commission (FCC) authorized an FM band effective January 1, 1941, operating on 40 channels spanning 42–50 MHz. (This was later changed to 88–106 MHz, and still later to 88–108 MHz, which increased the number of channels to 100.) On October 31, 1940, the first fifteen construction permits for commercial FM stations were issued, including one to Don Lee Broadcasting System for a station in Los Angeles at 44.5 MHz, which was issued the call sign K45LA. K45LA signed on August 11, 1941 as the first FM station in Los Angeles, broadcasting from a tower atop Mount Lee; it is the oldest continuously operating FM station in California. Effective November 1, 1943, the FCC modified its policy for FM station call letters, and the call sign was changed to KHJ-FM, after its sister AM station KHJ. In 1946, as part of a transfer of stations to the new FM band, KHJ-FM was assigned to 99.7 MHz. In 1947, KHJ-FM was reassigned to its current broadcast frequency of 101.1 FM, eventually relocating its transmitter to Mount Wilson. In 1965, when KHJ adopted its "Boss Radio" top-40 format, that station was simulcast on KHJ-FM. From 1968 to 1970, KHJ-FM aired Drake-Chenault's "Hit Parade" format, an automated mix of older songs and current hits. In 1971, the station carried another Drake-Chenault top 40 format, "Solid Gold Rock And Roll". K-Earth 101 Oldies On October 16, 1972, KHJ-FM switched to what was then called a "gold" format, featuring older hit songs from the past. At the time, this "oldies" format featuring songs from 1953 to 1963 was a novel idea since