The correct answer is B. L.M.M. is installed at 1.0 km from the threshold.
The Localizer and Glide Slope antennas are installed at the ends of the runway, while the Localizer antenna is installed at 300 m from the other end of the runway.
The Localizer (LOM) is a radio navigation aid that provides lateral guidance to an aircraft approaching and landing on a runway. It is a VHF omnidirectional range (VOR) transmitter that emits a signal that is received by the aircraft’s VOR receiver. The LOM signal is used to keep the aircraft on the correct path to the runway.
The Glide Slope (GS) is a radio navigation aid that provides vertical guidance to an aircraft approaching and landing on a runway. It is a VHF transmitter that emits a signal that is received by the aircraft’s Instrument Landing System (ILS) receiver. The GS signal is used to keep the aircraft on the correct glide path to the runway.
The Localizer and Glide Slope antennas are typically installed at the ends of the runway, with the Localizer antenna located at 300 m from the other end of the runway. The Glide Slope antenna is located at the same point as the Localizer antenna, but it is offset from the runway centerline by 150 m.
The Localizer and Glide Slope antennas are used in conjunction with the Instrument Landing System (ILS) to provide precision approach guidance to aircraft. The ILS is a radio navigation system that provides both lateral and vertical guidance to aircraft approaching and landing on a runway. The ILS is used by commercial and military aircraft to provide a safe and efficient way to land in low visibility conditions.