Sorry Chillie,

The aerial on the roof is for the OEM built in cordless phone, not sure if you guys get that in the US or other countries.

What you basically do is pop a sim card into the internal system which activates the handsfree phone in the X5, the aerial is a signal booster so if you get out of the X5 it allows you to have a larger reception if you walk away from the vehicle and using the cordless handset.

I guess its kinda like the a cordless home phone.

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