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The illustration shows an addition of the output of the top right and top right, and the addition of the output of the bottom right and bottom right with the help of power combiners and then subtraction of the second from the first with the help of power dividers. The subtraction process is completed by the addition of the 180-degree phase shift with the help of phase shifter in the path of the second sum. The channel produced by top right and top left is labeled, sum channel and the channel produced by bottom right and bottom left is labeled, Elevation-difference channel. The sum channel and the Elevation-difference channel give an angle error signal.