Check the listing for details. Dipole Antenna Halyard Arm for Rohn 25G or Amerite 25 Type Tower Sections. Condition: New. Listed at 57.60 USD. Description This standard side arm is designed to provide a convenient method for raising and lowering of a dipole antenna (15 lbs or less). It is constructed from 6061 T6 aluminum resulting in a strong, light weight corrosion resistant item. The halyard arm has a 1-1/2 inch diameter pulley to reduce the effort required when raising a dipole antenna. Once installed, the halyard line is held captive by the pulley assembly. Specifications Over-all Length: 36 inch (plus or minus 1 inch) Tubing Width and Height: 1 inches (outside measurements) Tubing Material: 6061 T-6 aluminum Attaching Hardware: Two 5/16 inch coarse threaded (18 TPI) U-bolts U-bolt Torque: 8 foot/lbs (96 inch/lbs) maximum Pulley Diameter: 1-1/2 inches Weight: 2.9 pounds (without halyard line)Maximum Lifting Capacity: 15 Lbs. antenna plus ice load Line Diameter: 1/4 inch to 3/8" diameter (smaller diameters may be used; but, 1/4" is the recommended minimum diameter to avoid getting the line pinched between the pulley and the bracket) Line: Any weather resistant line.