Castle FM also refers to a radio station based in Edinburgh, Scotland — 98.8 Castle FM, formerly known as Leith FM.Castle FM is a currently inactive (as of August 2012) short-term radio station based in Carrickfergus, County AntrimThe radio station transmitted twice annually between 1998-2005 and after a six-year break will return in July 2011.Castle FM broadcasts a mixture of music, news and information for a potential audience of over 50,000 adults in the East Antrim area.