Got some more information from Jon…
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confirmed that the antenna thankfully does not need to be part of the system certified so once we have a certified system, each user is free to pick the antenna most appropriate for their needs, as long as it does not violate the FCC power density limits of 1 watt per MHz of channel width for this band.
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Since UBNT is nearly complete getting a modular certification for the XR3, we only need to get the unit part 15 certified, which is closer to $3k estimate (official quote coming later today)
Can this be applied to other frequencies as well?
no, the certification is specific to the radio / board combination used, therefore the certificate will be for 3.65-3.70GHz only