In situations that require an extension cable to relocate a wireless LAN antenna these are the cables you need. FCC part 15.203 dictates the need for a non standard interface to be used for connectors designed for use on spread spectrum wireless devices. These coaxial cable assemblies feature a reverse polarized SMA male to female configuration allowing you to simply remove the antenna from the base unit and relocate using these extension cables to link the antenna to the base unit. This type of extension cable with non standard interfaces can be difficult to find but are typically available in stock from L-com.