Taking up his role next Monday (7 June), Arendt will be responsible for helping Planet Rock maximise its growth potential as the UK radio industry moves towards a digital future.
In addition to founding Hallett Arendt, Arendt has previously been a director of London speech station LBC, alternative music stations XFM and NME Radio, CanWest Media UK, and a number of independent stations across the UK.
Malcolm Bluemel, chief executive of Planet Rock, said: "With digital radio coming of age, it's important that Planet Rock has the team it needs to take best advantage of the inexorable move to digital. Jonathan comes to us with invaluable experience in radio at the highest level, and we are very fortunate that he has joined us."
Arendt said: "This is a unique opportunity to join a station that has led the way in digital. Planet Rock's growth continues with listening up by 45% over the past year. I am looking forward to working with Malcolm and his exceptional team in continuing to take the station forward in both audience and commercial terms."
Planet Rock's national sales are handled by Absolute Radio and it recently started working with commercial rights and strategic sponsorship agency, Brandmeetsbrand, on its sponsorship sales.
According to the audience measurement system Rajar, Planet Rock had a weekly reach of 694,000 listeners in the first quarter of this year.
Last month, the station won the Sony Radio Academy Award for best digital station.
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