3db Racing Antenna

3db Racing Antenna recommended when it can be mounted in the center of a flat roof, with no objects 18" in any direction. If you have a roof rack, light bar or need to mount somewhere other than the center of the roof, select the No Ground Plane Antenna Frequency Range: 138-174mHz Please specify race channel in notes above or we will tune (cut) to mid (151.625) Cut Chart Frequency Whip Length 150 45 1/8" 151 44 3/8" 152 44 1/8" 153 43 3/4" 154 43 3/8" 155 42 7/8" 156 42 5/8" 157 42 1/4" 158 41 3/4" 159 41 1/4"   Mounting Instructions Mounting your antenna properly determines the range of your two-way radio. A metal roof with an antenna mounted in the center with no obstructions (roof rack, light bar) 18" in every direction provides the farthest range. Roof Racks - Mount the antenna at the highest point of the rack. Use a no ground plane antenna. No Roof - Pick a spot in the middle of the car. The intersection of two tubes can also act as a ground plane. Mounti