These cables are used to connect broad cast transmitter to grounded antenna or UHF and micro frequencies so asto avoid the risk of radiation from transmission line. The important feature of such transmission lines to carry signals without much effect on quality to other point of connection is characteristic impedance. These lines may be rigid, flexible, air-spaced or filled with different dielectric to achieve desired characteristic impedance. They are mainly used in Cable TV, CC TV for both military and commercial applications. Sigma Cables manufactures Co-Axial Cables as per Belden specifications. In Co-Axial Cables, shielding is provided which helps to eliminate external disturbances so as to give a clear reception at the receiving end that is on TV screen, etc.