The answer is if it's really an issue in one's area, there have been a lot of proof of concepts but the real world just doesn't seem so far to be affected the way the FUD mongers are claiming.
If someone were truly paranoid they would have to have a lined pouch to carry their fob in only taking it out when using it in the car, but even then you have the potential of signal interception. The only question is which transmitting schema BMW uses and if you're comfortable with it.
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