Would you like to use external antenna?
Or just expanding range by modifying schematic/layout w/o external antenna?
We would like to use an external antenna, possibly with the BCM20732 but rather with the BCM20732S.
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There is a version of the module called the BCM20732E which is offered without the antenna connected to Pin 10.
Existing regulatory approvals will not apply and there is very little in the way of documentation available for the "E" module related to external antenna design.
Unfortunately, because of the additional support required, this version has a slightly different engagement criteria, so you will need to discuss with your local/regional Broadcom sales channel to see if an engagement is possible.