These 5/8 Wave antennas utilize a chrome coil design with the enhancement of a heavy-duty tapered rod for maximum durability in tough environments. Features • The matching coil is supported by a low loss coil for superior performance in heavyduty applications • The tapered coil housing design enhances appearance and prevents moisture from entering the load • Mates with all 1-1/8” -18 thread mounts, including 3/4” mounts