This rebroadcast signal was received by two directional yagi antennas on the aircraft carrying the Rebecca unit, the usual location for the aerials being on either side of the aircraft cockpit. The signal was then sent to a conventional ASV radar display, with the vertical axis measuring time (and thus distance) and the horizontal showing the strength of the signal. If the aircraft was approaching the Eureka from the side, the horizontal pulse would extend further on one side of the display than the other, indicating the need for the aircraft to turn toward the shorter blip in order to fly directly toward the Eureka.