Please answer a few questions:
I read in this news group platforms ordered with BT are shipped with an antenna. I ordered one and it just arrived ..no antenna.
 
I was also under the impression models with the new BT module (PBA31307) had an on board antenna.
I guess not as I see the MMCX connector still on th board.
 
Why they didn't use something like:

http://www.linxtechnologies.com/index.php?section=products&category=antennas&subcategory=embeddable&series=chip_antennas

 
 
DV