shenzhen manufacturers 433mhz spring antennas/coil spring antenna433mhz Spring Antennas Model GBT-433-2.5AElectrical Data :1,Frequency :433+/-5 mhz2,Gain :2.15dBi3,VSWR: less than 1.54,ISO9001:2000 standards5,3-7days shipment Packaging & delivery : 433mhz spring antennaPackaging detail :plastic bags in carton boxDelivery time : with in 3-7 days after receiving the paymentBy express like international express , Air freight Or shipping