Pro - reduction of the drag coefficient by maybe .001 percent (a WAG not even a SWAG).
Con - less effective comm radiation pattern.
If you want to trade comm effectivity for less drag go with a wingrip enclosed antenna.
Or just concentrate on reducing cooling drag for more bang for the buck in terms of effort.
My totally, untried, and therefore, totally untested and not backed by any evidence, empirical or otherwise, opinion.
But then, offered with no expectation of renumeration in any form, or with any reason.