The second of these antennas is the E-W bi-directional array comprising the east and westaerials. Again as illustrated in Figure 2, its azimuthal gain pattern is identical to that of the N-Sbi-directional array, but perpendicularly oriented (as a consequence of the fact that the twoarrays are physically at right angles to each other). This pattern is again obtained by applyingthe E and W aerial voltages to a differencing network that vectorially subtracts them (E-W) toproduce what will ultimately become the “X-axis” voltage
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