The station began operations in 1996 as
Ultimate Radio 103.5 UE, carrying a
CHR/Top 40 format with the slogan
The Spirit of Zamboanga. In 2013,
Viva South, Inc. acquired the franchises of Ultimate Entertainment Inc. In October 2014, the station went back on air as
Oomph Radio, carrying a
CHR/Top 40 format. In June 2016, the station rebranded back to 103.5 UE and added 70s, 80s and 90s to its playlist, despite retaining its format. However, the following month, Oomph Radio returned. In February 2017, the Oomph Radio brand was retired once again due to management decision. On May 1, 2017, the station was relaunched as
Halo Halo, the first and only FM station in each city playing only
Original Pilipino Music. ==Halo Halo stations==