Key Remote's Range?

[Nakatomi]

What is the normal range you should be able to lock and unlock the X5 with the key remotes? My keys work fine, but if I am more that say 20 feet from the car, the signal isn't strong enough. On my Dodge Charger for comparison, I can be looking at my car from my office window and lock it a half a block away.

I have had the X5 for a couple weeks now, and drive an hour to and from work, so figured the batteries have had ample change to charge....

Thanks guys!