8a(tm) heavy duty 1-a 1 / 2 a� diameter extension mast constructed with structurally strong fiberglass, chrome-plated brass ferrules, with 1"-14 threads (upper male, lower female) on the ends. The mast is hollow so the coax cable can be routed through the center. Actual physical length is 91a� tall. Recommended mounting kits: 409-R or 410-R This product ships in approximately 1 days