After being instituted a construction permit as WEBU in 1988, the station signed on with an adult contemporary format, and then classic rock, all under the call lettersWMJB. After stunting with TV theme songs, the station flipped to rhythmic adult contemporary in the fall of 1997. Adopting the calls WKPO, the station was known as "Power 105-9" with a more pop/dance sound featuring hits from the 1970s, 1980s and 1990s with less repetition. By 2000, it had evolved into a full-blown Rhythmic CHR format. In December 2001, the station became known as "105-9 KPO"; soon after, it became "Hot 105-9" with the same format. As a rhythmic station, WKPO fared better in the Janesville area, although it did have some success in the Madison area as its format was unique to that market. During its time as a Rhythmic, the station was an affiliate of the Portland, Oregon-based "Playhouse" morning show. At Midnight on January 10, 2007, WKPO abruptly dropped Rhythmic Top 40. After looping "Hip Hop Is Dead" by Nasall day on the 10th, the station reverted to a stunt of different music from different formats, with voiceovers suggesting any one of them could be the new format that would launch on January 13. At 10AM on the 13th, WKPO's new format was unveiled: album-oriented rock as "105.9 The Hog," promising "Everything that rocks, not just from one decade." "You Shook Me All Night Long" by AC/DC and "Smells Like Teen Spirit" by Nirvana were the first two songs played on the new "105-9 The Hog." The new format and the "Hog" imaging are a direct copy of Saga Communications-owned WHQG in Milwaukee. Indeed, "105-9 The Hog" aired the Bob and Brian show—a program that originates from WHQG—during its morning drive time for a period. Coinciding with the format switch, the station's call letters changed to WWHG. However, the Rhythmic format would make a surprise return to the Madison radio market on January 26, 2007, when WSLK dropped their simulcast of WHLK to become WJQM, "106.7 Jamz." When the Wisconsin State Journal asked Keith Williams, general manager of WWHG, about the format being picked up by another outlet in the market, he said has no regrets about switching off the rap music, but he said he'll listen to the new hip-hop station. "I love the format," Williams said. "I wish them the best of luck." In January 2014, Good Karma Broadcasting announced that it would sell WWHG and sister station WTJK to Scott Thompson's Big Radio. As part of the deal, the new owners began operating the stations through a local marketing agreement on February 1. The sale was completed on May 12, 2014 at a purchase price of $1.45 million.
