 XEWB-AM received its concession on January 25, 1956.It was originally on 760 kHz with 5 kW day and 1 kW night, operated by Radio Golfo, S.A.However, in the 1960s, it began operation on 900 AM as a co-channel booster to co-owned XEW-AM in Mexico City, with 50,000 watts daytime and 5,000 watts nighttime.