Four Dipole Base VHF Antenna, 138-174 MHz, frequency band.

• ✓ Adjustable Radiation Pattern for Circular, Cardioid, or Bidirectional Coverage
• ✓ Maximum Wind Resistance up to 175 mph in Extreme Weather Conditions
• ✓ Heavy-Duty Aluminum Construction With Corrosion-Resistant TXylan Coating
• ✓ Continuous Grounding System for Superior Lightning Strike Protection
• ✓ Includes Mounting Hardware for 1.5-2.5 inch Diameter Mast Installation
• ✓ Optional 7-16 DIN Connector Available for Specialized Applications