I checked the radio plug on the back of the head unit and it is plugged in. The real reason is because I live on an Island with horrible radio signals. However my stock radio was a lot better. I also listen to sports on AM and that is the worst. I have a normal sized antenna on a Silverado. Is there a way of adding extra antenna's that will not be seen? I will not put a 20 foot antenna on my truck, haha! I was thinking that you could put a few antennas in between the bed and the cab in that little space as long as it was unnoticeable or even put them under the hood. I know it would not be as good as exposed to the outside, but can you hook up several at once? If you know how to wire them, and where they could go, or if it can even be done let me know! Thanks a lot