... electric power,Microwave Steel Tower,Steel Structure of Substation Ligntning-protection Ground wire (conductor) tower and Earth mat1 Description of ... mesh, circuit orbit, 51-union radiation oscillator antenna mast, lightning-protection rod, range finder, DME, antenna mast, DVOR antenna mast ... been normally operating in the civil aviation, air force system, and get the praise from leaders of CAAC(Civil ...