The signals were split on their way to their respective antennas and amplitude modulated with a low-frequency signal, 90 Hz or 150 Hz. The two signals were then sent out of directional antennas that produced large broadcast patterns aimed slightly left (90) and right (150) of the runway mid-line or above (90) and below (150) the glideslope. The patterns were relatively wide and aimed such that they overlapped in the center, indicating the proper line to fly.