Signals intelligence is an interesting topic, doubly so from orbit. The article covers some Cold War hardware, meanwhile today the largest antennas deployed tha

Signals intelligence is an interesting topic, doubly so from orbit. The article covers some Cold War hardware, meanwhile today the largest antennas deployed that we know of are from the Orion satellites, with an estimated 100m diameter primary dish, nearly as long as a football field, and its predecessor Magnum with one of approximately 77m, both with a very unique "unfurling" mechanism given their size. https://en.wikipedia.org/wiki/Orion_(satellite) https://en.wikipedia.org/wiki/Orion_(satellite) https://www.globalsecurity.org/space/systems/magnum.htm https://www.globalsecurity.org/space/systems/magnum.htm