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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