In case of GSM radio, it causes - sadly - quite a lot of directionality (for other types, like WiFi, too, but not as much, due to lower operating range as a whole, and higher frequency). This is, probably, reason why N950 sucks so much @ signal strength compared to N900 - even despite clever helical antennas design (...) This result in super signal when aiming device at "correct" angle, and 80% worse, when changing it just a 40 degrees (both numbers made up, to give and idea of what I'm talking about). Consider, that iPad is designed to work with WiFi, not GSM/3G - especially the former will get affected.