«Radio is not defined by the device itself or the radio waves it uses, but by how it functions as a ubiquitous companion that entertains and informs people outside their homes. Television may still rule the in-home audience, but radio has portable appeal, plus the listener pays no direct cost for the content of radio broadcasts. More important, radio resonates in the hearts of many as a personal medium, a friend.» (FERGUSON; Douglas A, Editor's Remarks, Journal of Radio Studies, Novembro, 2007, pag 91)