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Null fill inradio engineering is used inradioantenna systems which are located onmountains or talltowers, to prevent too much of thesignal from overshooting the nearest part of intended coverage area.Phasing is used between antenna elements to takepower away from themain lobe and electrically direct more of it at a more downward angle in thevertical plane. This requires aphased array. Changing the relative power supplied to each element also changes theradiation pattern in this manner, and often both methods are used in combination.
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