In the late 1970s, a strange, rhythmic tapping sound began invading shortwave radio frequencies across the globe. It disrupted commercial broadcasts, aviation communications, and amateur civilian radio operators. Dubbed the "Russian Woodpecker," this relentless acoustic assault sparked wild theories of mind control and weather manipulation, concealing a far more terrifying military reality. The signal was actually the byproduct of an immense, secretive engineering project hidden deep in the Ukrainian forests. The Duga radar was an over-the-horizon early warning system, firing incredibly powerful radio pulses designed to bounce off the Earth's ionosphere. Its sole purpose was to detect the exhaust plumes of American intercontinental ballistic missiles minutes after launch. This investigative work reveals the physics and paranoia behind the Woodpecker signal. You will dissect the mechanics of ionospheric reflection, the massive power grid required to run the monolithic antennas, and the international diplomatic fury the interference provoked. Decode the most famous phantom signal of the twentieth century. Explore the colossal infrastructure of Cold War paranoia and the desperate technological race to foresee nuclear annihilation.