The Apollo 15, 16, qnd 17 missions, beginning in July 1971 and ending in December 1972, included the use of a rover, which allowed astronautes to explore a much larger region of the Moon from their base at the Lunar Module. A communications system facilitated communications to and from the Rover. This antenna, in its furled, stowed configuration, was part of that system. It is unflown, and NASA transferred it to the Museum in 1975.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.