ILS Modulation RNAV

Amplitude Modulation is used for both localiser and glideslope. This allows for simpler equipment. Although AMAM —Amplitude Modulated is more susceptible to static, as the ILSILS —Instrument Landing System operates in the VHFVHF —Very High Frequency and UHFUHF —Ultra High Frequency bands they are (theoretically) free of static.