Introduced at WWDC 2013, Apple’s AirPort Extreme boasts an all-new “mini tower” design, beamforming antennas and support for the super fast 802.11ac protocol. It’s been two years since the AirPort Extreme was last revised, and it’s undergone some major changes. Apple newest AirPort Extreme Base Station model A1521 (and the related Time Capsule) doesn’t just represent an 802.11ac upgrade; its…