Europa Clipper REASON High Frequency Radar Antenna

Engineers test one of two high frequency radar antennas for Europa Clipper’s REASON instrument on a hilltop at NASA’s Jet Propulsion Laboratory (JPL). The antenna is the narrow copper tube, held straight by several cables and a cross bar on the tower at right. In space, the copper tube will stick out straight on its own, but in Earth's gravity, the antenna requires supports to keep it straight for testing.