WTSA (1450 AM, "99.5 The Beast") is a radio station licensed to serve Brattleboro, Vermont.

The station is owned by Four Seasons Media and broadcasts an active rock format, also carried by FM translator W258DQ (99.5).

WTSA signed on April 19, 1950, as a sister station to WKBR in Manchester, New Hampshire.

[citation needed] The station became WMMJ on July 1, 1984, but was reassigned the WTSA call letters by the Federal Communications Commission on August 1, 1986.

[1] On March 4, 2019, WTSA changed its format from sports to active rock, branded as "99.5 The Beast" in reflection of its FM translator, W258DQ (99.5).