On November 22, 1987, Chicago viewers watched their screens go black, then fill with a figure in a creepy Max Headroom mask. Someone had seized control of a major broadcast signal from miles away, and to this day no one knows who did it.

This deep dive explores the only successful, unsolved television broadcast intrusion of its kind, exposing the raw physical vulnerabilities of analog TV. It traces a sophisticated technological feat hidden behind cheap, chaotic performance art aimed squarely at Chicago's media establishment.

• The first strike at WGN during the 9 o'clock news, and how engineers regained control by switching microwave frequencies
• The 90-second WTTW takeover during Doctor Who, which staff watched helplessly from miles away
• The capture effect: how a stronger pirate microwave signal overpowered the legi ...