Jiashan Jinchang Electron Co.,Ltd is one of the leading gsm manufacturers and suppliers,Website:http://www.antennascn.com, welcome to import gsm from our factory. PATCH include GSM, GPS/GLONASS/GALILEO COMPASS frequency at the moment. Size range: 10*10, 12*12, 15*15, 18*18, 25*25, 27*27, 35*35. Adventage: customizable Could debug the antenna freely according to your machine.