Better detection of stealth aircraft The Soviet P-18 surveillance radar uses 16 Yagi antennae in two rows mounted on a truck chassis. Since it operates in the metre-length frequency range it can more easily detect stealth aircraft than the modern radars which operate at a higher frequency. The American F-117 attack aircraft which was shot down over Serbia in 1999 was also detected with a modified P-18. NATO reporting name: Spoon Rest D. Developed for missile systems This model was developed in the Soviet Union at the end of the 1960s by improving the P-12, primarily to be used with S-75 air defence systems. The antennae are mounted on a Ural 4320 chassis and they can be rotated 360 degrees. The P-18 was introduced in 1971. It has been in service since the end of the 1970s in Hungary The Hungarian People’s Army brought the model into service in 1977 to gradually replace the P-12s. A total fleet of 45 radar systems defended and still defends Hungarian airspace, since the P-18 remains an integral part of the technical inventory of the radar regiment. The operating radar systems of the Hungarian Army have been modernised since 2000. The Moon radar experiment In 2000 the famous Moon radar experiment by Zoltán Bay in 1946 was replicated with a P-18. Bay’s experiment was the first occasion a radar signal was sent to the Moon and detected on return.