Cells on wheels (COW), or site on wheels,^[1] are telecom infrastructures, placed on trailer approved for road use, towed by heavy goods vehicles for loads of up to 3500 kg. These mobile radio base stations guarantee full operation in just one day and in restricted spaces. COWs provide fully functional service, via vehicles such as trailers, vans and trucks, to areas affected by natural disaster or areas with large user volume, such as major events. The backhaul to the network can be via terrestrial microwave, communication satellite, or existing wired infrastructure.

• Mobile radio base stations with flanged poles are mobile support structures composed of a special trailer with retracting stabilizers approved for road use. The antenna supporting pole, with a climbing ladder up to the summit, is fixed to the main base frame and is composed of cylindrical flanged sections integrated by two or three sets of guys with a standard height of up to 20 meters. The flanged pole mobile station, installable in eight hours, does not require civil work or foundations and is complete with lateral ballast concrete weights and a working platform in checkered plate.

　Hebei Changtong Steel Structure Co., Ltd located in the hometown of China Tower， is a modern big-scale professional company fabricating triangular communicationtower , four-corner communication tower , cable tower , single-tube tower , camouflage communication tower and transmission line tower . integrating design , fabrication and marketing,annualproduction capacity reaches more than 30,000 tons .

　Company always adhere to the business strategy of "survive by quality, develop by credit , increase efficiency by science andtechnology", continuously carry out technical transformation , complete production equipment , reliable production process , adopt advanced CNC angle steel production line , CNC sheet production line and various supporting equipment . The equipment has a first-class iron tower stakeout center , all of which implement microcomputer lofting , which guarantees the processing quality and provides a strong guarantee for production , which can fully meet the design and production requirements of various types of towers and substation structures .
　Our steel tower products have won good reputation from our customers,including China tower,China mobile,China unicom,China elecom , State grid and so on.In addition , our products also were exported to many countries and areas,including South American , Africa , Southeast Asia and Ireland.