Signal Hijacking AKA Pirate Transmissions AKA Broadcast Signal Instrusion

[related: UVB-76] –--- The unauthorized interruption, replacement, or overlay of a broadcast transmission, typically within analog television or radio systems. The phenomenon is most closely associated with eras in which transmission infrastructure—reliant on microwave relays, unsecured uplinks, or locally managed headends—was not designed with adversarial interference in mind, and therefore could be accessed or overridden with sufficient technical capability. Notable and frequently cited examples of signal hijacking include:

• Soviet pirate broadcasting: a loosely defined category of unauthorized and unsolved transmissions occurring within or adjacent to Soviet broadcast space throughout the Cold War. These include anomalous signals, intercepted channels, and persistent transmissions such as UVB-76.

• Southern Television broadcast interruption of 1977: a documented but unsolved case involving the alleged replacement of a regional U.S. broadcast signal with a warning for humanity delivered by the self-identified Vrillon of the Ashtar Galactic Command.

• Playboy Channel religious interruption: an incident from the mid-1980's in which a Playboy Channel broadcast was overridden by a transmission delivering a religious or moralizing message. Accounts vary in detail and verification, but the event is frequently referenced as an example of signal hijacking deployed as ideological or symbolic protest.

• Santa Barbara cable headend intrusion: an incident in which a disgruntled employee replaced the video feed of KNXT’s Channel 2 Eyewitness News with softcore pornographic material for approximately fifteen minutes, while the original audio continued uninterrupted.

• Max Headroom Incident: a widely documented case in which two Chicago television broadcasts were interrupted by a masked figure resembling the computer generated television host Max Headroom.