TIME : 26:04:23 HOSTS: Andy Walker and Sean Carruthers STUDIO DIRECTOR : Maurice Cacho EDITOR: Sean Carruthers SOURCE: www.labrats.tv/episodes/ep130.html   NOTES: - Terrestrial Radio - AM and FM . AM radio has existed since 1906. The first commercial AM station in the world was Montreal's XWA (later CFCF) in 1920. -