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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Five: feeder, the feeder is very important, we must choose good, and we want to know the general antenna distance can't more than 50 m, or receiving signal will become weak.
The radio and television signal emission facilities, including antenna, feeder links, tower masts (poles), ground network, satellite transmitting antenna as well as the auxiliary equipments thereof;