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From fairly reliable sources, I have heard that Ofcom uses a new method of triangulation which involves multiple remote drones receiving direct-line of sight signal from the unlicensed HF transmitter, and thus gaining precise triangulation of the TX site, sometimes at a distance of 100 or more km, if topography and drone height allow... this basically avoids Ofcom having to hunt for a hf groundwave at a distance of a few miles from the HF transmitter.
So it is now possible for Ofcom to triangulate precisely, within a few meters, the source of HF radiation in the United Kingdom, using remote drones at the appropriate height during calm weather conditions, at very low cost. This works well under long skip conditions, and badly under NVIS propagation conditions.
