Diamond Antenna Original X510HDN 144/440 Mhz Base Antenna 17.2 ft N-Type Fiberglass radomes Overlapping outer shells for added strength Strong waterproof joint couplings Stainless steel hardware Wide band performance Factory adjusted  no tuning required Highest gain High wind rating DC grounded Band: 2m/70cm Element Phasing: 3-5/8l/8-5/8l Gain (dB): 8.3/11.7 Watts: 330 (2m) / 250 (70cm) Connector: Type-N Weight: 5 lbs. Length: 17.2' Max Wind Resistance: 90 MPH