Glen Martin RT-424 4-1/2' Roof Top Tower - 4.5' Tall Aluminum Tower - USA Made Maximum Height: 4.5 Feet / Maximum Base Width: 24.5 Inches / Material: Heavy Duty 6061-T6 Aluminum. 1/8" x 2" x 2" Angle Stainless Steel Hardware: Nylon self locking nuts. Includes four brackets for rooftop mounting Wind Load Ability: 10.2 sq ft (85 mph) / 4.5 sq ft (150 mph) Maximum Mast Diameter: 2.375 inches / Maximum Mast Length: 5 feet / Maximum Balanced Load Weight: 125 lb center-balanced Rotator Plate: Fits most 4-bolt mounted rotators / Top-to-Rotor Distance: 34.75 inches / Weight: 17 pounds Additional items sold separately: mast, concrete bolts, roof bolts, mast clamps, thrust bearing, lightning protection. *Signature Required Upon Delivery*