CREATE TABLE table_name_53 (website VARCHAR(255), frequency VARCHAR(255), city_of_license VARCHAR(255), webcast VARCHAR(255))
Which website includes a webcast of listen live, a frequency under 680, and was licensed in the city of San Antonio.
    
SQL: SELECT website FROM table_name_53 WHERE city_of_license = "san antonio" AND webcast = "listen live" AND frequency = 680