This former RAF station was part of the Chain Home early warning radar stations built by the Royal Air Force (RAF) before and during the Second World War to detect and track aircraft.
More information on these stations can be found here
The following information was gathered together, and put into PDF format, by a gentleman called Mike Flude who lived nearby to the former RAF Hayscastle in Pembrokeshire.
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Also there is an excellent website with more details and more recent photos here