91X

91X (call sign XETRA-FM) is an alternative rock radio station based in Tijuana, Baja California, Mexico, that primarily serves the San Diego, California, area. It began broadcasting on February 11, 1983, and is known for being one of the first stations in the U.S. to adopt the alternative rock format. The station broadcasts on 91.1 FM and operates under Mexican ownership while maintaining studios in San Diego. 91X has a long history of promoting independent and alternative music, often spotlighting emerging artists and hosting live events.