Ubidium Antenna Elements are connected to the system through the coupling joint, each antenna has 2 coupling joints, one on each end.

When connecting the antenna element to the system it does not matter to which end it is connected, but you must ensure to not create a loop where the element is connected to the system through both joints. 

The coupling joint is cutout for the cable end plate and has a thread in the center, the cutout is then filled with a silicone seal which also protects the 4 contact pins. The locking screw of the cable end should then be screwed in to the thread, as the screw is tightened the silicone pad is compressed which allows the pins to make contact with the contact plates of the cable end. A tight seal also helps protect the connection against moisture and help prevent long-term corrosion. 

Firmly tighten the screws with the supplied screw driver. The silicone is more resistant than the original foam and needs to be compressed to seal properly and press the connector against the brass nut.