It is generally recognised that the first radio transmission was made on a temporary station set up by Guglielmo Marconi in 1895. This followed on from pioneering work in the field by a number of people including Alessandro Volta, André-Marie Ampère, Georg Ohm and James Clerk Maxwell. The title of oldest permanent or semi-permanent radio station is disputed by contenders in Europe (UK and Germany), and in the United States and Canada.
The several potential contenders for the title of "oldest radio station" are listed below, organized by sign-on date:
References
List of oldest radio stations Wikipedia(Text) CC BY-SA