With three 3.5" magnets, good grip holds large and heavy antennas securely on the roof, tailgate, or trunk of the car truck ^^ Right in the middle of the magnet is an NMO connector for installing fiberglass or trucker-style antennas ^^ Easy to assemble and ideal for most VHF UHF HF CB radio antennas ^^ 16.4 ft low-loss RG58A/U coaxial cable end with UHF male PL259 plug ^^ Soft rubber pads on magnets for scratch-resistance