WZRM (97.7 FM, "Rumba 97.7") is a Spanish-language radio station in the Boston market, carrying a Spanish contemporary hits format.

After weeks of dead air and a five-day long stunt of a loop of Tone Lōc's "Wild Thing", the station was relaunched on December 6, 1999, as WBOT, Hot 97.7, targeting the Greater Boston area with a mainstream urban format.

However, after the relocation of WBOT's transmitter to Great Blue Hill in Milton, Massachusetts, in summer 2005, the station's signal improved dramatically.

On August 20, 2006, radio industry website All Access reported that Entercom had agreed to purchase WILD-FM from Radio One; by the next day, Entercom had assumed control of the station via an LMA, and WILD-FM signed off with "Wild Thing" by Tone-Loc at about 7:00 p.m., as the station began stunting with Microsoft Sam's voice reciting a countdown (while interspersing a random quote a few times every 30 seconds or 1 minute) to 5:30 p.m. the following day, August 22, 2006.

During December 2016, rumors were circulating that Entercom was planning to split the WAAF simulcast and flip WKAF to an urban format in January 2017.

In addition, the Twitter profiles for the new afternoon hosts of WAAF only mentioned 107.3 FM; a simulcast for the station was also added onto the HD2 channel of WKAF and the HD3 channel of WEEI-FM, which, as HD Radio did not have signal interference, could cover areas of Boston that 107.3 didn't cover, thus eliminating the need for a simulcast and making room for such a move.

On January 5, 2017, at 10:50 a.m., in the middle of playing "You've Got Another Thing Coming" by Judas Priest, WKAF split from the simulcast and flipped back to urban adult contemporary with a heavy rhythmic oldies base, branded as "The New 97.7".

[6][7][8] On February 2, 2017, CBS Radio (which locally owned WBZ (AM), WBZ-FM, WBMX, WODS, and WZLX) announced it would merge with Entercom.

[10] On November 1, 2017, iHeartMedia announced that they would acquire WKAF, WBZ (AM), WRKO and WZLX (WBZ-FM would be swapped to Beasley Broadcast Group in exchange for WMJX).

To meet ownership limits set by the FCC, iHeart would place WKOX into the Ocean Stations Trust in order to be sold off to a different owner.