Pin 10 is designated as the external antenna pin, but the PIFA antenna is connected to it.
The new BCM20732E and BCM20736E modules support an external antenna via pin 10 (PIFA Antenna not connected).
However, there are no regulatory approvals for these modules or reference antenna designs to leverage.
I need to check and see if this part is ready to be supported through the Community Website here.
In the meantime, you may also want to work with your local Broadcom distributor and sk them to set you up on Docsafe, our internal system (requires an NDA).