Hackaday reports on a clever bit of radio engineering: a system called QuadRF that visualizes radio signals in three-dimensional space. Using an array of antennas, it measures the phase difference between incoming radio waves to pinpoint their direction and distance—then renders them as a real-time map. In a demonstration above a drone, the technique painted colored clouds showing the radio emissions both above and below the aircraft, making the invisible radio spectrum suddenly visible. Radio direction finding isn't new, but seeing it rendered this way turns what's normally abstract technical math into intuitive, watchable data.

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