approximately 80% country, 20% adult contemporary. The station was branded "Z-104". In 1982, WJEZ gained competition as WUSN also adopted a country format. At that point, WJJD 1160 adopted an adult standards format, known as "The Music Of Your Life". In 1984, Infinity Broadcasting acquired WJEZ and WJJD for $13.5 million. Oldies era In early August 1984, the station adopted an oldies format as "Magic 104" and its call sign was changed to WJMK. Dick Biondi was the first disc jockey heard on "Magic 104". Ron Britain was also one of WJMK's original DJs. Initially, "Magic 104" included a few currents in its playlist, but by early 1985, all songs from the current decade were dropped, with the station playing music from the 1950s, 1960s, and early 1970s. In 1987, the station's transmitter was moved to the Sears Tower, and its ERP was reduced to 4,100 watts. In 1991, the station's moniker was changed to "Oldies 104.3". In early September 1993, John Records Landecker joined WJMK as morning drive DJ, remaining with the station until 2003. In 1996, Infinity Broadcasting was purchased by the parent company of CBS. In 1999, with competition from the new Jammin' Oldies format of WUBT, WJMK increased the number of 1970s songs playing 3 to 4 per hour on the station while reducing the number of pre-1964 songs played to about 3 per hour while the 50's songs were cut to 2 per hour. The station added several dozen 80's songs playing about 1 every 2 hours. By 2002, the station would replace the All Request Saturday Night oldies show with a 1970s and early 80s program. On February 15, 2002, WJMK returned to its former moniker, "Magic 104.3", and its playlist was shifted to include more 1980s music, while further reducing the music played from the '50s and early '60s. In July 2003, the station once again changed monikers, going back to "Oldies 104.3" and its playlist was refocused on music of the '60s and '70s. In 2004, the station dropped the "Oldies" moniker and became known simply as "104.3 WJMK" with the slogan "The Greatest Hits of the 60s and 70s". Jack FM On June 3, 2005, at 4 p.m., WJMK switched to an adult hits format known as "Jack FM" at the same time veteran oldies station WCBS-FM in New York City made the same switch. The station had a 1980s centric