Wikipedia
XHRV-FM
XHRV-FM (branded as Exa FM) is a Spanish & English Top 40 (CHR) radio station that serves the Valle Hermoso and Matamoros border area.
The station was once located in San Fernando, Tamaulipas, where it broadcast on 100.9 MHz as XHSAF-FM.
Now, there's another radio station in San Fernando bearing the same callsign and frequency. It's a Radio Tamaulipas relay station.