downlead造句

For example, transmitting antennas for AM radio stations often consist of several mast radiators, each of which functions as a matched for a 75 ohm coaxial downlead to the receiver.
In some places, however, such as a deep valley or near taller structures, the antenna may need to be placed significantly higher, using a guide mast or drop ", and the longer the downlead is, the greater the signal degradation in the wire.
It's difficult to find downlead in a sentence. 用downlead造句挺难的