The entire length of the tower is equipped with a feeder (a coaxial wave-guide) through which signals are transmitted from the transmitter to the antenna on the spire.
信号传输线(一个同轴波导管)贯穿整个塔身，通过它，信号从传输器运送到塔尖的天线。
2
In a mobile base-station the radio circuitry usually sits in a cabinet and is connected by a cable to an antenna on the tower overhead.
手机基站的无线电路通常在一个机柜里，由电缆连接到高架塔上的天线。
3
The tower is designed to put the antenna at a maximum height on the spire.