1)professional antenna manufacturer 2)good quality, reasonable price 3)wide choice of products Antenna NameJCJB433AMain Electrical SPecificationsFrequency Range433MHzVSWRLess than 2.0Gain3.0dBPolarizationVertical Impendence50ohmMain Structure SpecificationsSize80MMConnectorSMA/BNC/TNCColorBlackEnvironment SpecificationsOperating Temperature-40 to 70°C Relative Humidity Range55% to 75% GSM Antenna ...