Download Data sheet: etc-250 ArticleNo/ P/N: ETC-250 Radiotype: Baseantenner ETC-250 Extruded Parallel Tube Clamp, 50 - 76mm Use to securely attach stub-base type omni antennas to a vertical pole or mast. Supplied with stainless steel V-bolts to suit 50 - 76 mm diameter tubes. Price request Download Data sheet: etc-250