Well, after a little bit of research, I see BNC, RJ-45 and other connectors being used. Might be that the connectors are not standardized. Looks like the RJ-45 is common. Could be they're using the RJ-45 for control signals, rather than the coax. Could be good reasons for that.
It probably uses the RJ-45 for control signals to switch relays in the antenna assembly to get the desired gain in the desired direction.
If any of the old timers remember the "super scanner" antenna for Base station CB radios that had three elements and used a relay box to switch directions. The antenna did not phyically move like other directional "beam" antennas. The superscanner did not need a Rotator.