I appreciate the response, however, I was hoping for replacement parts. I'm sufficiently adept at repairing it on my own. I had eventually found internal Wi-Fi antennas for mini-PCI network adapters (aka eBay). Although it means taking it apart again, I'll have a spare this time in case it occurs again (unlikely).
The plastic sheathing may have played a part as it continually slipped back until the lead eventually separated from the wire.