This heavy-duty base assembly (used in our Vertical Antenna Kit) is made from two pieces of composite material (high density polyethylene and wood flour) fastened with long lasting stainless steel hardware and includes a heavy duty zinc-plated steel U-shaped pivot piece. Overall length is 11 inches and width is inches. A short length (7-inches) of aluminum mast section is included for easy connection to your mast sections. A 3/8-inch diameter zinc-plated steel hinge pin is included to fit the pivot piece. In addition, 4 galvanized 12-inch long ground stakes are included for use when setting the base assembly directly on the ground. The larger section of composite material has 6 drilled holes that will accept the ground stakes, or you can use 3/8 inch bolts (not included) to attach to other surfaces (fence posts, tree trunks, concrete pads, deck floors, etc.). Depending on your total height and top load (antenna, mount, pulley, etc.), you can then easily walk up the mast. The Base Assemby will work with either the standard or ribbed-sided aluminum sections. The pivot piece does not lock into a vertical position; therefore, guying is required to maintain the mast in a vertical position.