The audio for Channel 13's regular programming is not on the radio. Because of the way the audio for television stations is set up, all T.V. stations in the United States that use channel 6 broadcast their audio just below the frequency for FM radio. That frequency is 87.7, while the FM spectrum runs from 88 to 108. Most FM radios are capable of picking up the 87.7 frequency. The audio frequencies for all other television stations are not near the FM or AM spectrum, and therefore those radios cannot pick up those T.V. audio signals.
Some electronic stores sell radios that can tune in the audio from television stations.