Apple AirPort Extreme Base Station A1143 (MA073LL-A)

Overview
The Airport Extreme, version n, dissected (noice internal shots) Evolution of the ABS

Manufactured by Foxconn (internal part U01H335 / U01H335T01)

AirPort devices on Wikipedia On Amazon.com (reviews)

The device uses three antennas. The MIMO configuration is assumed to be 3x3.

The Mini PCI card is part AR5BMB-0072TA (MB72). The FCC photos show the card labeled with a MAC starting with 00:16:CB.

A teardown of the device was previously featured on iFixit (linked from here), pictures recovered by archive.org are linked below..
 * High-res board top
 * High-res board bottom