257K-6/.328/595
257 Series Spot-Focusing Horn Lens Antenna Frequency Range: 20.5 to 24.5 GHz Spot Size: 1.0 to 1.5 Inches Lens Diameter: 6 Inches Focal Length: 8 inches from lens Polarization: Circular Polarized Port : 0.396" ID Circular Waveguide with UG-595/U Flanges (18 to 20.5 GHz)