Key Components & Features

• 81-S Swivel Mount (Base): Made from heavy-duty 316 stainless steel for maximum corrosion resistance. It features standard 1"-14 threads to fit almost all marine antennas.

• 408-R Stand-off Bracket (Upper): A molded, white plastic insulated bracket that secures the antenna's radome. It includes a "gate" with a wing nut for quick opening and closing.

• Universal Sizing: The stand-off bracket is designed for 1.5" diameter antennas but includes reducing inserts to accommodate 1" and 1.125" diameters.

• Dual-Axis Pivot: The base mount permits mounting on vertical or horizontal surfaces and allows the antenna to lay down in your desired direction.

Technical Specifications

Installation Tips

• Spacing: For maximum stability, place the stand-off bracket as high as possible—ideally at least 3 to 4 feet above the swivel base.

• Reinforcement: If mounting to a thin fiberglass surface, use a "backing plate" (marine-grade plywood or G10 board) behind the surface to distribute the load and prevent cracking.

• Cable Routing: Be careful not to pinch or crimp the coaxial cable when assembling the antenna to the swivel base.

In The Box

• 1 x Style 81-S Stainless Steel Swivel Mount

• 1 x Style 408-R Stand-off Bracket

• 1 x 1" Reducing Insert

• 1 x 1.125" Reducing Insert

Do you need help choosing the right fasteners?

Since the 410-R does not include screws, you will need eight 1/4" stainless steel fasteners (four for the base, four for the bracket). I can help you determine whether to use wood screws or through-bolts based on your boat's hull thickness.