Radio wave

If the electrical oscillation is at a radio frequency, the emitted electromagnetic wave is a radio wave.

If an electrical circuit supplies a rapidly alternating current to a transmitting aerial, electric charges move back and forth in the aerial. This oscillation produces a radio wave that travels away through space. The wave has the same frequency as the oscillation producing it: if the charges complete more back-and-forth cycles each second, the radio wave has a higher frequency.