特别提出了减小天线下倾角的重要性，以及天线下倾角调谐方式对减少同频干扰的作用。

Especially, the importance of reducing the declination Angle of antenna was emphasized and the effects of adjusting antenna declination Angle on reducing homo-frequency interference were expounded.

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对基站天线的基本原理、天线选型、天线参数设置、天线安装等方面进行了描述，对天线下倾角、分集距离等进行了重点讨论。

It describes base station antenna principle, type selection, parameter set and installation, with emphasis on down-tilt and diversity space.

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