An improvement
As others have said, there is definitely an improvement with the signal strength. I live outside of great coverage so there are spots where I've learned I always lose a connection. When connected in the car, I've noticed that I will not disconnect.
It's been confirmed many many times while driving in my wife's car (with no vehicle antenna).
It's useful in areas where the wireless company, in this case AT&T, are too cheap to install cell towers properly spaced. So, if you drop calls but then get a great signal shortly after your drop (in the same area over and over)... then this antenna will likely help.
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2012 X3 35i | Space Gray | Sand Beige | Sienna
Packages | M-Sport | Cold I & II | Tech | Premium | Sound | BMW Apps, HUD, Net
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