 In 1967 WTSA had a staggering Hooper Index listenership of 49.7 market share out of a 13 station measure.WTSA-FM came much later in 1975, and with ownership changes, the format on AM was moved to FM.On March 4, 2019, WTSA changed their format from sports to active rock, branded as "99.5 The Beast" (simulcast on FM translator W258DQ Brattleboro).