Michael wrote: He had a mast
mounted refector, a regular reflector hung properly and and a second one up
on the windward side flag halyard plus had stuffed his wooden mast with
crumpled tin foil (a old Pardey trick.) Two had radar detectors that picked
up our 10cm beam.

If you were looking at him with a 10cm set then his mast full of
crumpled tinfoil did nothing to increase his return. The reflecting
surface has to be wider than the wavelength.

Fresh Breezes- Doug King