Threaded Antenna Support w/6" Pipe Mount, Oval 4-Way Base & 1.5" Collar. A perfect blend of form and function, Antenna Mounting Systems by Rupp combine good looks with innovative designs. Our locking collar holds the antenna securely, yet unlocks conveniently for lowering. Made of forged and anodized aluminum for strength and long lasting beauty. Threaded mounting packages are ideal for tuna towers and tops.. Features:. Mount Type: Pipe. Base: Oval 4-Way. Pipe: 6"