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The instrument unit was designed by NASA's George C. Marshall Space Flight Center in Huntsville, Ala. IBM manufactured and assembled the instrument unit at its Space Systems Center in Huntsville. The Instrument Unit sat between the upper S-IVB stage and the Command Module/Service Module. (NASA)
Several large Deep Space Tracking Network stations with huge radio antennae were required in order to receive and send telemetry and control signals back and forth to the Apollo spacecraft. This particular antenna is 85 feet wide. (NASA)
The 210 foot antenna at the Perth station was the subject of the 2000 film "The Dish" starring Sam Neill and Patrick Warburton. It is a largely fictional account which downplays the significance of all of the stations in the DSTN network. During the course of the Apollo 11 mission, several stations were required in order to receive telemetry and television signal from the spacecraft and the moon.