Select the Stretch button in the Extend Tools tool box.
When prompted to Place fence, click on two points to define the opposite corners of the fenced area. This area should include the endpoints of the wires.
When prompted to Define origin, click on a reference point, usually one of the wire endpoints.
When prompted to Define distance, click on another point to define the distance that the wire should be stretched. The wires will be extended by this amount.
