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The glide-slope transmitter operates within the Very High Frequency (VHF) range, specifically around 108.0 to 111.975 MHz. This frequency range is critical for providing vertical guidance to aircraft during the approach phase of landing.

Glide-slope antennas are part of the Instrument Landing System (ILS), which helps pilots align the aircraft with the runway's centerline while descending at the correct angle. The VHF frequencies are chosen for glide-slope systems due to their ability to provide precise navigation and capture the necessary signals over the distances required for safe and effective landings.

Other frequency ranges, such as UHF (Ultra High Frequency), HF (High Frequency), and LF (Low Frequency), are not suitable for this purpose. UHF is typically used for communication and radar systems, while HF is more commonly associated with long-range communication. LF is generally used for navigational aids like non-directional beacons (NDBs) and is not effective for the glide-slope function which requires a higher frequency for better resolution and accuracy.