EXA FM 99.3 (Ciudad Obregón)

EXA FM 99.3 (XHOX-FM) broadcasts in Ciudad Obregón, Sonora, carrying the national Exa FM format from MVS Radio, and is owned by Radio Grupo García de León.

The station began as XEOX-AM, which received its concession on September 26, 1939, and signed on November 20 of that year from Los Mochis, Sinaloa. It was owned by Luis Felipe García de León and broadcast on 1230 kHz. In 1941, for economic reasons, it moved to 1340 kHz in Ciudad Obregón and soon after to 1430. The current concessionaire took possession of the station in 1977, and in 1994 it became an AM-FM combo, with the FM station initially broadcasting on 106.9 MHz.

In May 2005, XHOX-FM moved from 106.9 to 106.5 MHz and increased its ERP from 3,000 to 10,000 watts. As part of its 2017 concession renewal, on May 4, 2018, the station moved again to 99.3 MHz in order to clear 106-108 MHz as much as possible for community and indigenous radio stations. In addition, three months earlier, on February 8, the station surrendered its AM frequency.