Radio Free Skaro was a name listed in the Doctor's Five Hundred Year Diary. (NOTVALID: Tom Baker stars in John Lloyd's lost Doctor Who adventure, The Doomsday Contract)
Behind the scenes
This is a reference to the real world fan produced podcast series Radio Free Skaro. Tom Baker stars in John Lloyd's lost Doctor Who adventure, The Doomsday Contract delivers no information about Radio Free Skaro other than its name, so this likely supposed to be an exact counterpart to the real world podcast, especially when one considers that the Doctor Who franchise exists in-universe.