TP-LINK TL-WN651G

Overview
This device is basically identical to the TP-LINK TL-WN650G, but this device has an external antenna (via RP-SMA connector).

The MadWifi wiki references this device as having an AR5212 chipset for some versions (< v1.4 and v1.5)... but this may not be entirely accurate. It may be that confusion arose from the PCI ID (168c:0013 is used by AR5212, AR5213, and some early AR241x devices).

PCI ID and OUI (00:1D:0F) mention
 *  ath5k phy0: Atheros AR2414 chip found (MAC: 0x79, PHY: 0x45)