KJXK (102.7 FM, "102.7 Jack FM") is a commercial radio station in San Antonio, Texas, broadcasting an adult hits radio format using the "Jack FM" brand. It is owned by Alpha Media with radio studios on Eisenhauer Road in Northeast San Antonio. KJXK has an effective radiated power (ERP) of 100,000 watts, currently the maximum for American FM stations. The transmitter is atop Tower of the Americas in downtown San Antonio, off Cesar Chavez Boulevard.