WTOS (910 kHz) is a commercial AM radio station licensed to Bangor, Maine, United States.

[5] Initially the station had a very limited schedule, with a first reported broadcast on January 13, 1924, of the Sunday service of the First Universalist Church.

[9] The station was briefly deleted in September 1925,[10] but then relicensed on October 14, 1925, again as WABI on 1250 kHz, to the First Universalist Church.

[16] During the early 1940s, WABI again changed frequencies; the North American Regional Broadcasting Agreement moved the station to 1230 kHz in 1941.

[17] WABI carried CBS's schedule of dramas, comedies, news, sports, soap operas, game shows and big band broadcasts during the "Golden Age of Radio".

[18] However, in 1949, health problems forced him to retire and sell WABI to a partnership between former Maine governor Horace A. Hildreth and Murray Carpenter.

[29] Over time, the station shifted from contemporary hits to a full service middle of the road format.

[34] A year later, WABI and its FM station, now called WWBX, were sold to Gopher Hill Broadcasting.

[35] Clear Channel Communications signed a local marketing agreement (LMA) with Gopher Hill in early 2001.

[39] Clear Channel announced on November 16, 2006, that it would sell its Bangor stations after the company was bought by private equity firms.

[41] Blueberry again dropped WABI's standards format on September 1, this time for sports talk provided by Boston's WEEI.

Blueberry officials told the Bangor Daily News, "We have not made any final decisions regarding what’s going to happen with that radio station.

"[50] In a filing with the Federal Communications Commission (FCC), the company stated that it intended to sell the station, and that if a buyer was not found, the license would be surrendered.

On January 11, 2019, WABK switched to a simulcast of Skowhegan-based mainstream rock station WTOS-FM, under the new WTOS call letters.