This OHC-137-15 standard gain horn antenna has a nominal gain from 14 dBi to 16 dBi across the band and a square cover flange. It covers the frequency range from 5.0 GHz to 8.5 GHz. Alternative connectors, inculding N type and SMA type, waveguide flange are available on request. Standard gain horn antenna OHC137-15 is kown as a waveguide horn covers WG14, WR137 and R70 bands. It is manufactured using the precision CNC integrated sections providing accurate, consistent and reliable performance, which ensured that the deformation rate is less than 0.01 under limiting conditions. The series antennas cross-polarization is less than -40dB. This series antennas are suitable for standard field stength meaurment and standard field stength generator and antenna gain measurements. HPBW of OHC137-15 has a E-Plane & H-Plane beam width from 23 degree to 34 degree. Side lobes in the H plane are all more than 20 dB down. First side lobes in the E plane are 13 dB down, second side lobes are 18 dB down and all other E plane lobes are more than 20 dB down.