Omnidirectional Fiberglass Base Antenna UHF 410-490 MHz, 4.5 dBd gain, pre-tuned. Browning p/n BR6157. 

• Up to 150W
• No ground plane 
• 80 MHz band width 
• 5/8 over 5/8 wave
• 34" (85 cm) tall 
• Heavy-duty fiberglass
• N Female connector 
• Solid brass base
• Includes mounting bracket with stainless steel hardware
• The mounting brackets are designed to fit on a mast from 1 3/16" to 2 7/16"
• The antenna's hole diameter is about 33 mm.