MODEL RELEASED. Nostradamus radar system. Philippe Dorey, researcher at the National Office of Aerospace Study and Research (ONERA) in France, pointing out the position of a plane detected by Nostradamus, a transhorizon radar system. The system is composed of 288 conical antennae, positioned over three 400 metre-long branches. The transmission and reception components are buried underneath the system. Nostradamus is capable of detecting aircraft flying 700-2000 kilometres away. The system uses low frequency waves (6-30 MHz), which bounce off the ionosphere (outer layer of the Earth's atmosphere) and allow the radar to detect targets beyond the horizon.