SINCLAIR~0db VHF Fbg Base Ant Collinear omni, 118-137 MHz. Designed for aviation service under extreme conditions PVC radome .Constructed of high strength fiberglass with an aluminum coaxial skirt and base pipe. The combined features of light weight, unity gain, and low cost make this antenna a natural choice for moderate base station antenna requirements. Mounting Clamp 005 provided for parallel mounting to a minimum 1.9 inch diameter support pipe.