I installed my Sirius with the kit from BSW close to 2 years ago. Recently the system has had a hard time acquiring a signal. Some mornings it's a mile or more, other days I can go half an hour and not acquire a signal. I'm assuming it's the antenna. But I can't find the correct antenna anywhere. A Sirius antenna I got from a local high end electronics shop didn't work- the plug end is different. And two local dealers said the antenna isn't available as a separate part, only with a full installation kit for $600. Any ideas? I'm getting tired of 200+ mile drives listening to old-school radio.

__________________
'04 E53, 4.4 Sport
'97 E39 528i
'86 911 Carrera, track car
'96 BMW R1100R