Coax Connections

All CB coax ends in one of three possible ways:  

PL-259 (Screw-On)

The PL-259 connect is most popular, and connects to the long, barrel style studs you see on many mounts.   It's very easy to install.  It's also the same type of connection that all coax cables use to connect to the radio - so every CB coax cable has at least one PL-259 connection.  Many have PL-259 on both ends, with the second PL-259 being used to connect to the mount (see picture below).  

Ring & Terminal Style

Ring and terminal style coax are the other two connections coax connections.  Both are ideal when a low profile connection is desired.  The ring connection's all plastic construction is extremely weather and rust resistant, while the terminal connection is the only way to wire up certain mounts (like ball mounts or side mounts).  

Both ring and terminal style connections are compatible with lug style mounts/studs (see picture below).