Whenever you speak into a radio, the audio waves that come from your mouth are converted into electric current. The carrier wave then becomes modulated. This modulated carrier wave can then be amplified depending on the reserve. As a result of the antenna signal, electrons oscillate back and forth, which produces magnetic and electric fields. When the frequency reaches a certain level, radio waves will be emitted. Once the receiving antenna catches the radio waves, then this signal will be demodulated. Basically, the AC current will be converted to a direct current, allowing us to hear the original audio.