Posted by wlanparts.com on February 16, 2014
Ubiquiti TC-GND UBNT Ethernet ESD Ground Grounding
These provide a very good ground for your outdoor Ethernet connections.
TOUGHCable TC-GND Connectors: Specifically designed for use with Ubiquiti TOUGHCables and available in 20 in a box, TOUGHCable TC-GND Connectors protect against ESD attacks and Ethernet hardware damage while allowing rapid field deployment without soldering.
Also reviewed here.