Hi,

Here is a link to a video which shows how to replace the screen in a Palm Treo 650.

I realize that this is not your problem but it is handy in that it shows at approximately 1:05 minutes into the video how to remove the antenna.

https://www.youtube.com/watch?v=p7lr3T-U...

The antenna is available online. Here is just one supplier.

http://txparts.com/palm-treo-650-antenna...