BR6051 fiberglass omnidirectional base wideband antenna.

• VHF 115-170 MHz, no tuning
• Up to 100W
• 2.5 dBd gain with ground plane
• Unity gain without ground plane 
• 55 MHz band width 
• 43" 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.