Shanghai Er li Industrial Co ., Ltd. locate at Shanghai China, it is majored in production and trade. Since 2004,the company begin to machining and produce the hardware, plastic, communications cable, Textiles.70% of the products are exported to the markets of Europe, USA,Middle East, Southeast Asia. Our company have an enterprises, YuYao Communication Equipment Factory was established at 2005, it empolder the car and ocean shipping mobile com munication electronic products,the most products are: GPS antenna, GSM antenna ,CB antenna, TV/DVB antenna,HF antenna, FM/AM antenna, Decorative antenna etc. The quality of product accord the standard of communication technic. Case Studies Barcelona Metro Undergoes Historic Wireless