The 'main' antenna is the PCB that has the USB-C port and there's also a diversity antenna on the headphone jack PCB. Here's a photo of both of them. The actual antennas are the tiny metal pins stuck with red glue, do be careful not to snap them off when assembling/dissembling your Pro1/Pro1-X.
We normally don't sell these, it's only for repair purposes. But I am happy to ship one to you if you're okay to cover shipping 🙂
Send us an email at info@fxtec.com, include your shipping address and provide me with the ticket ID. I'll be able to issue you an invoice.