Eric "Tracking the Lincolnshire Poacher" - BBC Radio 4 Documentary goo.gl/FpggZN
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Mark Dain I remember listening to that! Number stations are a fascinating use of crypto.
Eric Sadly not many broadcast any more, I suppose they've only been stood-down & not entirely decommissioned. I've tuned into a fair few jamming signals on my little short-wave, never heard a NS live though.