I have just fitted a tracking system and when I have power to the tracking system I loose some of the radio  stations,I  know it would be easy just to say that it is the tracking system, but I have fitted thousands of these to all sorts of vehicles  and only have had this problem a few times, I just wonderd if anyone had come across this and knows of a simple solutions, I have tried taking the power including earth straight from the battery, disconnected the antenna but still does it, any body any ideas

Thanks