The antenna installation should pay attention to the following questions:

(1) lateral directional antenna tower installation: in order to reduce the influence of antenna tower on antenna directivity diagram, the installation should be paid attention to: when the distance of the center of the directional antenna to the Eiffel Tower is lambda / 4 or 3 lambda / 4, the biggest directional outside the tower can be obtained.

(2) the omni-directional antenna tower side installation: in order to reduce the influence of antenna tower on antenna directivity diagram, in principle, the antenna tower can't become a reflector antenna. So in the installation, antenna should be installed on the edges and corners, and make the antenna with any part of the tower recent distance is greater than the lambda.

(3) multiple antenna tower: as far as possible to reduce the coupling between the different network to send and receive letters antenna effect and influence each other, try to increase the isolation between antennas, the best solution is to increase the distance between each other. Antenna tower, should first adopt vertical installation.

(4) for traditional literal antenna (vertical polarization), because the antenna (RX and TX, TX - TX) between the isolation degree (30 db or higher) and the requirements of space diversity technology, requirements have vertical and horizontal distance between antennas, generally is about 50 cm vertical distance, horizontal distance of about 4.5 m, then must increase infrastructure investment, to expand the installation of the antenna platform, and for dual polarized antenna (plus or minus 45 ° polarization), as a result of plus or minus 45 ° polarization orthogonality can guarantee + 45 ° and 45 ° the isolation between the two antennas satisfy the requirement of intermodulation of isolation between antennas (30 db) or higher, so the space between the dual polarized antenna interval only 20 to 30 cm, mobile base station can don't have to build the tower, only need to build another pillar of iron 20 cm in diameter, will cover the corresponding dual polarized antenna direction can be fixed on the iron pole.

天线的安装应注意以下几个问题：

(1) 定向天线的塔侧安装：为减少天线铁塔对天线方向性图的影响，在安装时应注意：定向天线的中心至铁塔的距离为λ/4或3λ/4时，可获得塔外的最大方向性。

(2) 全向天线的塔侧安装：为减少天线铁塔对天线方向性图的影响，原则上天线铁塔不能成为天线的反射器。因此在安装中，天线总应安装于棱角上，且使天线与铁塔任一部位的最近距离大于λ。

(3) 多天线共塔：要尽量减少不同网收发信天线之间的耦合作用和相互影响，设法增大天线相互之间的隔离度，最好的办法是增大相互之间的距离。天线共塔时，应优先采用垂直安装。

(4) 对于传统的单极化天线(垂直极化)，由于天线之间(RX-TX,TX-TX)的隔离度(≥30dB)和空间分集技术的要求，要求天线之间有一定的水平和垂直间隔距离，一般垂直距离约为50cm，水平距离约为4.5m，这时必须增加基建投资，以扩大安装天线的平台，而对于双极化天线(±45°极化)，由于±45°的极化正交性可以保证+45°和-45°两副天线之间的隔离度满足互调对天线间隔离度的要求(≥30dB)，因此双极化天线之间的空间间隔仅需20-30cm，移动基站可以不必兴建铁塔，只需要架一根直径20cm的铁柱，将双极化天线按相应覆盖方向固定在铁柱上即可。