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The Story Of The Max Headroom Incident, America’s Creepiest Unsolved TV Hack
(allthatsinteresting.com)
A community dedicated to unsolved crimes, disappearances, and other unexplained phenomena.
Post a writeup of the mystery, or a link to a blog article with a writeup on the mystery in question
Reads to me like they set up a transmitter on the local network's recieving dish - acting as their feed.