The Russian Woodpecker - Interesting Engineering<p><<a href="https://interestingengineering.com/the-russian-woodpecker-the-soviet-signal-that-could-be-heard-on-the-radio" rel="nofollow">https://interestingengineering.com/the-russian-woodpecker-th...</a>><p>Duga Radar - Soviet Over-The-Horizon Radar (OTH) aka 'Russian Woodpecker'<p><<a href="https://en.wikipedia.org/wiki/Duga_radar" rel="nofollow">https://en.wikipedia.org/wiki/Duga_radar</a>>