In 1946, the station signed on at 98.9 MHz as WSNJ-FM in Bridgeton, New Jersey, a farming community about 35 miles south of Philadelphia. It was owned by Eastern States Broadcasting Company. At first it simulcast its AMsister station, 1240 WSNJ. But in the early 1960s, it became an affiliate of the WQXR Classical Network, based in New York City. In the 1961, WSNJ-FM's frequency moved to 107.7 MHz, after a frequency swap with the Philadelphia Bulletin's WPBS, and the station resumed simulcasting the middle of the road format of popular music and news on 1240 WSNJ. In 1971, WSNJ-AM-FM were sold to Cohanzick Broadcasting, which held the license until the station's move to the Philadelphia suburbs. In the early 2000s, the station's frequency and city of license were changed to allow it to move into the more lucrative Philadelphia market. To clear space on the FM band for the new operation, high school station WHHS was moved from 107.9 to 99.9 MHz and a Philadelphia translator of classical station WWFM was taken off the air. During transmitter testing, 107.9 used the call sign WPPZ and broadcast gospel music; owner Radio One eventually gave that call sign and format a permanent home in the market on 103.9 FM. The new permanent Urban AC format as WRNB went on the air on February 4, 2005. Radio One paid $35 million for the "move-in" FM station, which was now able to attract Philadelphia listeners and advertisers. On September 1, 2011, Radio One moved WRNB's programming to 100.3, and the Urban Contemporary format of WPHI-FM moved to the weaker signal 107.9 FM as "Hot 107.9" on September 4 at 5 p.m.. The first song on "Hot" was Hot In Herre by Nelly. On November 6, 2014, at 7 p.m., WPHI dropped the "Hot" format and became the fourth classic hip-hop station in the United States as "Boom 107.9". The last song on "Hot" was I Like It by Sevyn Streeter, while the first song on "Boom" was 99 Problems by Jay-Z. On September 27, 2016, at Midnight, WPHI and WPPZ swapped formats and call signs with "Boom" moving to 103.9 FM, and "Praise" moving to 107.9 FM. On December 10, 2018, WPPZ flipped from urban gospel to Urban Oldies branded as "Classix 107.9".
