Wireless Joint

the pad layout looks identical to a normal MHF4 on that SW23, so I think you probably could put one down on the trace

I believe they cut or made SMA pigtails and removed the connectors, just soldered directly to the PCB.

The diversity connectors appear to use regular MHF4 or some U.FL (not sure which or what kinds actually)...

(this is SW23 ones)