I recollect once in 72/73 going to visit for some reason or other, my father who was stationed as part of a very small detachment of RAAF and CSOS chaps who operated out of some very small huts surrounded by antennae in a paddy field out past Yuen Long NT presumably Ping Shan. I don't remember any other bldgs/flagpoles or the like..just some walkways out to the middle of these watery fields and a some small (smaller than Romney Huts) single storey huts in the back of nowhere.
These guys were,though not my father. part of an RAF mob working sometimes on TaiMoShan and the RAAF guys at Little Saiwan also (Where we had our xmas parties when not having them on Lantau. circa 71-74.
R.A.F. Kong Wei ?
The description sounds like the R.A.F. Kong Wei listening post, which was near to Ping Shan. There some notes and photos of it at https://gwulo.com/node/44382