... 15years' manufacturer Antenna ( Base station antenna )GSM900MHzSingle polarization 90º 17dBiall kinds of Base station/microwave/UHF antennasCertificate:ROHS,ISOFrequency:800,900,800/900,1800 ... , ceiling,wall, log periodic,tri-sector, array, directional, Yagi,directional,parabolic CDMA,GSM,UHF,GPS,etc.Polarization:dual/vertical/horizon/circularMOQ: as ...