The 30cm signal cable is a thin—ultra-Low Loss RF coaxes window jumper cable. Window jumper cable is designed to connect the outdoor aerial to signal repeater through a window edge without drilling through the wall. It is a convenient option for people in rental units or listed buildings where drilling is not an option. The window jumper cable is extremely low-loss and will have a negligible effect on the repeater unit’s signal loss.
The window jumper cable comes with N-type female connectors that connect to the standard COAX cable. To use a Window Jumper Coax, you need 2pcs signal cables(one connect from the outdoor aerial to the jumper and another to connect from the jumper to the repeater).