What type of antenna is utilized in an aircraft's ILS glideslope installation?

An aircraft's Instrument Landing System (ILS) glideslope installation primarily employs a folded dipole reception antenna. This type of antenna is specifically designed to receive the narrow, frequency-modulated signals that are critical for guiding aircraft during the final approach to a runway. The folded dipole configuration offers several advantages, including a compact design and wide bandwidth, which allows for efficient reception of the signals used in precision landing systems.

The folded dipole's radiation pattern is well-suited for this application, as it can provide adequate coverage and sensitivity to the signals transmitted by the ground station. This ensures that relevant data about the aircraft's position relative to the ideal approach path is accurately received.