261J-15/387S
261 Series Standard Gain Horn Frequency Range: 220-325 GHz Gain: 15 dBi Gain (Nom) 3 dB Beamwidth, E-Plane: 35.95 ° 3 dB Beamwidth, H-Plane: 29.71° Side Lobes, E-Plane: 20 dB Side Lobes, H-Plane: 20 dB Polarization: Linear VSWR: 1.15:1 (Typ) Waveguide Port: WR-3 Waveguide with UG-387/U-M Flange