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 Length150              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"