Groundplate mass plate equipped with nuts and bolts

Made of porous bronze, essential to acquire an appropriate mass to install Loran, GPS, Navigators, radio-telephones SSB and to cut down radio interferences.  29.630.01 TypeStandard Equal to copper grounding m21,5 mm155x51x13  29.630.02 TypeGiant Equal to copper grounding m23,45 mm300x80x13  29.630.00 Typemedium Equal to copper grounding m22 mm205x64x13