The antenna in your BMW car is designed to pick up the magnetic energy and send it to the car's radio receiver. Here are some exceptions for satellite radio transmissions, and a standard car radio antenna cannot get the signs from these specialized broadcasts. It is easy to tell if your radio antenna is good or not. Most apparently, if it is physically broken, then it's definitely need changed. And if you cannot get any radio station for a while or the signs are not stable, then you are supposed to change a new radio antenna. It is to install a new radio antenna in your BMW car. We are glad to be your first choice when you want to make this move. You will never regret shopping on our website. What we offer you is all BMW genuine OEM antennas with a surprising cheap price.