ground terminal in fig4 c except command inputs from an external beam controller 440 to identify the beam positions and associated nulls for multiple beams concurrently pointed to different satellites in accordance with the present invention the command pointing is depicted in the 440 and 441 blocks based on 1 where the terminal is located and how it is oriented and 2 time of the date to derive satellite positions in inclined orbits the external beam controller 440 calculates the pointing directions toward desired satellites and nulls against undesired satellites in inclined orbits in terms of local azimuth and elevation or equivalent the information for a beam position and associated nulls is captured by the updated bwv stored in a buffer 420 in a rx dbf processor 430 fig5 a depicts a schematic view of an embodiment of a parabolic antenna in accordance with the present invention the reflector 502 has a paraboloid surface and is illuminated by a linear feed array 504 comprising four feed element aligned in the local elevation north south direction the beam from the satellite is indicated schematically at 506 by switching the transmit drive signal to various elements of the feed 504 as described previously the beam can be made to scan in the elevation direction as indicated at 508 in another embodiment in accordance with the present invention and illustrated in fig5 b the reflector has a parabolic toroidal surface that is parabolic in the elevation direction and circular in the azimuth direction the feed 530 of this embodiment comprises four independent four element linear arrays e g 522 and 524 each of the four element arrays is positioned in the focal plane.