Just purchased a low mileage 2006 650i convertible. FM, AM and XM radio reception is nearly non-existent. In Portland Oregon, a scan of the AM band finds NO STATIONS! Dealer says the problem is because the antennas are in the trunk. I'm wondering if others have experienced this problem and if there is an after-market fix. I will not be renewing my XM subscription since the signal fades when I drive by 15 foot trees! Wondering why they even bother to install a radio in this car. Other than that, love the car.