1 min readSCaN A to ZNASAOct 20, 2017 Image Article B is for Beam Waveguide Antenna. SCaN uses a variety of antennas for space communication. A beam waveguide antenna is a large steerable curved antenna. The antenna has five mirrors that reflect radio signals from space and sends the signals down the antenna to the pedestal room that is underground. The pedestal room has radio receivers that allow computers to translate the signals into information humans can read and see.