Refer to figure.
The Glide path is, together with the localizer, part of the Instrument Landing System (ILS). These combined give the pilot vertical and lateral guidance towards the runway.
A glide slope antenna, as seen in the figure, uses an antenna array (typically red and white) which is located on one side of the runway in a building typically between 750 ft (230 m) and 1250 ft (380 m) down the runway from the approach end of the runway. The glide path antenna transmits a carrier signal in the Ultra High Frequency (UHF) range (typically between 329.3 and 335.0 MHz). The centre of the glide path shows the ‘ideal’ glidepath of approximately 3°
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