During the course of the 20th century the invention of the wireless, initially achieved almost exclusively in solitude by Guglielmo Marconi, proved to be a motor of technological and social changes, thanks also to the innovations and improvements brought about by scientists and researchers in different countries.

Thus an invention that was initially devised for the transmission of telegraphic signals, i.e. in code, soon became a means for sound signals (broadcasting) and later for audiovisual signals (television, originally known as “radiovison”); an invention initially devised for the reception and transmission of messages between two points also became, and above all, with the introduction of circular broadcasting, a means of mass communication and then, at the end of the century, with the advent of the mobile telephone, a means of universal communication from person to person.

It is on the basis of Marconi's intuition that radio waves are able to join the two farthest points on the planet and overcome sidereal distances, allowing, through satellite transmissions, to give way for the first time in history to authentically global communications.

Today, although many people are not aware of this, a significant part of the messages, both personal and diffusive, that we receive via Internet are traveling, at least for a segment of their journey, on the waves of the air. Probably even this one.