While mid-wave antenna is mostly iron towerantenna, we do not use directional antenna except that we need special service in special area.
中波天线大部分采用铁塔天线，非特殊地形或特别要求的服务区外，均采用不定向天线。
2
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。
3
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.