The station was awarded its original broadcast licence in September 2006 as Original 106.5, and commenced broadcasting on 20 May 2007. It was owned by a group of investors under the name Tomahawk Radio. The station originally broadcast an Adult Oriented format, with 40% of its music coming from past or present Top 20 charts. Based on other JACK fm stations, Bristol's 106 Jack FM runs with a strapline of "Playing What We Want" and mostly having no presenters. The voiceovers and straplines are usually voiced by former Blake's 7 actor Paul Darrow, and is referred to on station only as The Voice of Jack.
106 Jack FM replaced Original, which had previously broadcast used the same frequency, on 2 December 2009 following a staged on-air argument and station hijacking the previous day.
Since the relaunch, nearly all the DJs have been removed from the station, and Jack FM Bristol switched to an automated music format for most of the time, as used by the UK's other JACK FM stations. The only live shows currently running on JACK FM are the weekday breakfast show, which is generally known as 'That Morning Thing', hosted by Ian Downs (or Downsy), Alice Crocker and Richard Johnson, JACK's World of Sport, hosted by Jed Pitman on Saturday Mornings  and The Bush Telegraph hosted by Andy Bush on Sunday mornings.
A drive-time show was launched on the 19th of September 2014 with Damien St John presenting from 4PM-7PM on weekdays called 'The Damien St John In-Car Listening Experience'.