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I’ve been a globe-trotting, freelance science communicator for over 30 years. I specialise in performance-science, innovative educational training programmes, quirky, science-based corporate events and STEM tutoring. I’ve performed round the world, on TV (Brainiac, Blue Peter etc.) and in theatres and schools across 30 countries.
@shortcolin There's a great article at https://boghall-radio-masts.blogspot.com/
It says
The antenna was a Riometer (Relative Ionospheric Opacity Meter) ... The wires formed one plane of a corner reflector, the other plane was formed by the sloping terrain.
The centreline of the antenna was directed at the north celestial pole, so the antenna received radiation from the same area as the earth rotated .
It wasn't used for any military or HF communication applications.
So you were right on that.
Boghall Radio Aerial Masts

Can you help with information about this very unusual radio aerial in the Pentland Hills just south of Edinburgh?

@shortcolin Thank you for sharing your wonderful Psion memories. What a wonderful blast from the past. Psion 5 is my favourite tech of all time. Great to see you collection of other models too.