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The invasion defense antenna was a planetary defense system utilized on Terra 10 to gather, focus, and broadcast the naturally occurring spiroid epsilon waves of that planet. The resulting wave would gradually reduce the space between atoms of any organic matter it encountered, effectively shrinking anyone approaching the planet to a mere 1/16th of an inch.
In 2269, the antenna was used not in defense but as a means of garnering the attention of the starship Enterprise and its crew in an effort to enlist their support for the endangered inhabitants of the planet. (TAS: "The Terratin Incident")