When the number of antenna beams are increased the channel capacity also gets increased.

To permit the antenna beam to be directed to any part of the sky, the antenna is mounted with the axis of the horn horizontal.

The antenna beam becomes wider as the aircraft gets farther away, making the position information less accurate.

Two overlapping antenna beams are formed, which are steered in slightly different directions, usually such that they overlap at the 3dB-point of the beams.

The typical solution is to limit the main lobe of the antenna beam so that it does not point near the ground.

The sum signal corresponds with the antenna beam along center-line of the antenna.

The sum signal is created by a feedhorn structure positioned to maximize signal at the center of the antenna beam.

The resulting interference can produce feedback signals that move the antenna beam away from the aircraft.

The frequency band allocated to each antenna beam can be identical because the uplink signals are orthogonal in polarization.

The antenna beam is steerable (by means of a moving receiver) within about 20 of the zenith.