Carefully split/cut the copper tape (which protects parts of the motherboard from heat) with a razor blade to allow removal of the antenna wire.

Be careful not to cut too deep and damage the wire.

Unclip the antenna wire from the motherboard.

Unclip the antenna wire from each clip on the battery case (until the speaker).

Be careful not to rip the wire, however the wire should be strong enough and should come out with enough force.