phased antenna system

Many AM (amplitude-modulation) broadcast stations use sets of two, three, or fourphased vertical antennas. This results in a directional pattern that optimizescoverage, so the station can reach the greatest possible number of listeners in itsdesignated area. The nulls in the pattern reduce or eliminate interference withother AM broadcast stations.

In two-way radio communications, several vertical dipole antenna can be placed end-to-endand fed in phases. This is known as a collinear antenna and is a specializedtype of phased array. At low elevation angles, the radiation and response areenhanced relative to a single vertical dipole. This gain occurs at the expense ofradiation and response at higher elevation angles, increasing the range of communicationfor surface-to-surface communications.

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