Check out FierceWireless. This is why Blackberry is getting stomped. Corporate employees want to use their own phones. However, I did not realize how much Apple dominates enterprise activations (according to Good).
Multibeam antennas for massive capacity.
The MatSing ball is the really impressive antenna here. Those have 48 independent cross-polarized beams that are 6 degrees by 6 degrees arranged in a 12x4 (horizontally by vertically) pattern.