When I was at Kwaj doing some interference testing on their C-Band PAR and the THAAD prototype that end of the island was pretty well controlled traffic-wise. That C-band PAR was essentially the prototype design for the later SBX seaborne radar.
I am pretty sure that SBX is X-Band. Someone said that they are testing a high energy antiballistic missile system. There is certain irony in that, in that British radar designs were a fall out from an attempt to design a “death ray” to shoot bombers out of the sky. The analysis showed that it was not practical (using 193’s technology) but it was possible to “see” them. The atoll must have the most RF energy per square mile of any place on earth.