Gupta R. Hand Book of Electronics 1952

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Radio communication, within recent decades, has become a popular way of conveying the intelligence between places that may be separated by thousands of miles. The wireless type of electrical communication utilising the radio wave transmission is called radio communication. The radio waves are the electromagnetic waves produced due to the escape of electrical energy into the free space. They travel with the velocity of light and consist of electric and magnetic fields at right angles to each other. These fields are perpendicular to the direction of travel of the wave. Therefore radio communication can be defined as the interchange of symbols, signals, intelligence between two or more points, employing electromagnetic waves as the medium of transmission