I'm going to be taking it over to my wife's grandparents house this evening. They live less than a five minute drive away. If it still has this problem at their home I'm going to have to look deeper. It's possible the amp is faulty, or possibly the adapter is faulty as well. Either way I'm going to try and narrow this down this evening. I do know there is a local TV station that transmits close to us. However I don't have any problems with other devices in my home. I have not had any problems with my other keyboard picking up static from anything.

Gary, that's funny someone was picking up phone conversations with their keyboard I had an old clock radio that did that.