350-512 MHz, 5dB Gain, Collinear Antenna 

Triple-plated brass fittings for a great appearance and rugged durability in tough environments.  The matching coil is supported by a low-loss coil form for superior performance in heavy shock applications.  Heavy-walled, double-sealed housing for maximum weather-proofing.  Mates with all 1-1/8"-18 thread mounts, including 3/4" mounts.