I am not going to tell you how because I think a few of the sites got shut down, but see if you can find out your options by entering your VIN. I bet you thats the satellite radio antenna. IIRC that only should have been installed if you had that as an option. Do you have shark fin on top of the car?

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For Sale Thread:
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2004 X5 3.0i - Sold
1998 328i Convertible (e36) -sold
2004 325xi (e46)- sold

Any questions?: DICE mediabridge|gauge rings|LED Angel Eyes|front door carrier|GT1/DIS/INPA/NCS|bluetooth retrofit|SIRIUS Retrofit|fuel filter|Dorman DISA|Roof Rack Delete|Sunroof drains|AC drains|rear sway bar swap|o2 sensors|VCG|Osram Night Breakers