Got a gps for my Wife's Z4M. Tested it out in my X5 works great. Even nicer than the built in nav unit. But, it wont grab a gps signal in the Z4. Tested it in other cars, still works great. But, in the Z4 nothing. Not even when the top is down. Just tapping into the collective knowledge of the "outpost". Holding it in my hand and walking up to the Z4 (while engine running) the gps signal dies when I get within 3 feet of the car. Any ideas?