So Blu-Tack wasn’t really doing it for me, something had to be done.
Managed to drill a hole through a brass standoff, think it might have been one from a parallel port.
threaded the cable from the antenna through it, then hot glued it in place.

Drilled out brass stand-off

Drilled out brass stand-off

Taped up gaps

Thread cable and fill with hot glue

Screw into Lian Li case

Solder 2 pin connector

Connect to RF board

Win