... ,Microwave Steel Tower,Steel Structure of SubstationLigntning-protection Ground wire (conductor) tower and Earth mat1 Description of Ligntning ... orbit, 51-union radiation oscillator antenna mast, lightning-protection rod, range finder, DME, antenna mast, DVOR antenna mast, ... zinc spraying, spraying painting as preservative treatment; all rod pieces of reverberatory net are jointed by standard parts, ...