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。

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Before 1980, a single tower with a high - powered transmitter might cover an entire city, but limited spectrum availability meant that it could not serve many customers.

1980年代之前，一座有著高功率发送机的无线电塔，就足以涵盖整著城市，但可取得的频谱有限，因此能服务的顾客不多。

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If a newcomer joins the network (client devices will be joining and leaving continuously) and happens to be near a transmitter, the tower and its various clients will have to scramble to find yet another channel they can all use without causing interference.

ECONOMIST: Difference Engine