Robert Ramalho is Public Relations, was vice-president of the Brazilian Association of Public Relations, seccional of Alagoas (ABRP-AL), is professional journalist and lawyer. Summary: In the current days it is the radio in full century XXI, the one of the most important vehicles of communication of mass and formador of opinion together with Internet, having also surpassed the television. Not obstante, it is of more easy creation, with a sufficiently low financial cost. Having in little time one total recovery of the invested money. One knows, today that instead of diminishing, it has only increased the number of senders of radio in the whole world.

Not yet research in Brazil exists, but, without a doubt none, will have become fullfilled a research for the regulating agency the number of them will be very bigger of what notice is had. Words Key: Senders of radio, communication, mass, public, diffusion. 1. As everything started the Radio is defined as a station or one emitting device of programs of broadcasting, being considered a media them of mass for the majority studious, or of social nature, for others, and is based on the diffusion of the sonorous information by means of electromagnetic signals (hartezianas waves), through the diverse existing frequencies in kilohertz, megahertz and gigahertz. Its transmission happened for the first time in experimental way for the scientists Lee De Forrest and Reginald Aubrey Fessenden, at the beginning it century XX, in 1908, when in the high one of the Eiffel Tower, in Paris, an emission was caught in the city of Marseilles, also in France. This, however if possible to happen thanks to perseverance of the American scientist Samuel F.B. Morse, inventor of the telegraph through wires, first system of communication invented in the world, responsible for the first transmission of long distance in the world. But they are the German scientist, Siemens, creator of the Dynamo in 1876, and Americans Alexander Graham Bell, inventor of the transducer Mary had little lamb), quadrinha infantile American who would be part later of known Stories of Mother Goose.With the invention of an antenna capable to receive frequencies low, in the band of 30 kHz, for the Russian scientist Aleksander S.