The Null fill reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Null fill

Null fill is used in radio antenna systems which are located on mountains or tall towers, to prevent too much of the signal from overshooting the intended coverage area. Phasing is used between antenna elemnts to take power away from the main lobe and electrically direct it downward.

See also beam tilt.

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