KSQL (99.1 MHz, "Radio Estereo Sol, 98.9 y 99.1") is a Spanish language radio station in Santa Cruz, California. The station simulcasts the signal of KSOL (98.9 MHz) in San Francisco. KSOL and KSQL program a format consisting of regional Mexican music and talk shows. Both stations are owned by Univision. Its studios are in the Financial District of San Francisco, and the KSOL transmitter is in the Los Gatos Mountains.
There are two booster stations for KSOL: KSOL-FM2 in Sausalito since 1992, and KSOL-FM3 in Pleasanton since 1997.
The 98.9 MHz frequency is the third station in the San Francisco market to use the callsign KSOL. The first was the AM rhythm and blues station at 1450 kHz (the current KEST). The second was a popular soul music station at 107.7 MHz (now known as KSAN). The current KSOL is unrelated to the previous two stations.
The station at 99.1 MHz was, for many years, KLRS ("Colors"), airing an a New Age music format targeting Santa Cruz and San Jose. The station was eventually purchased Viacom The two stations tweaked KOFY's adult album alternative format and adopted the call letters KDBK (98.9 MHz) and KDBQ (99.1 MHz) - "Double 99" in July 1990.