I have experienced first hand, and have heard many cases of CB radio causing interference in speakers. I had a couple of questions related to it: 1. What type of modulation (AM or FM or both) causes this interference? 2. How big does the antennae need to be for this to happen? 3. My neighbour doesn't get it for some reason but I do - any reason why his speakers don't get the interference but I do? 4. Why do we actually hear the voice of the radio user and not some noise - surely if we were hearing the modulated signal it would just sound like a bunch of noise?