For each antenna type, a single horizontal antenna pattern is recommended for use in the frequency assignment process. This report compares measured and theoretical data with FAA antenna pattern specifications. Received 19 October 2015 accepted 26 December 2015 published 29 December 2015. The horizontal localizer antenna pattern now has a substantial effect on the separation required between localizer stations. In order to reduce siting effects, antenna patterns have evolved from the nearly omnidirectional 8-loop to the highly directional traveling wave and log periodic dipole antennas. ILS localizer antennas have undergone significant changes in recent years. One of the factors which affects a stations signal strength in space is its horizontal antenna pattern. What is the range of a localizer The localizer transmitter operates on one of 40 ILS channels within the frequency range of 108.10 to 111.95 MHz. This is done by choosing frequencies in a manner which provides certain minimum cochannel and adjacent channel desired to undesired signal ratios at critical points of the service volume. An onboard ILS receiver simply compares the aircrafts current position with static signals from antennas aligned with the desired localizer and glideslope. The localizer antenna provides lateral guidance, and the glideslope antenna provides vertical guidance. The frequency assignment process is meant to insure interference-free service within the service volume.
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