It is generally recognised that the first radio transmission was made from 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.
[1] The several potential contenders for the title of "oldest radio station" are listed below, organized by sign-on date.
These are not restricted to radio broadcasting, i.e., the transmissions were not necessarily intended to reach a wide audience.
Continued daily commercial broadcast up to 1997 AM 880 kHz (1925–1930) AM 1120 kHz (1930–1931) AM 630 kHz (1931–1933) AM 1120 kHz (1933–1941) AM 1150 kHz (1941—present)