In aerodynamic, you only make something round if you want something else to spin 360 degrees inside it. No other purpose justifies the drag costs of a around housing.
Array would be on the small side for a mini EWA, but then that’s probably pushing the limit of what the airframe can carry payload wise.
Other possibility is that this will act as a datalink relay to extend control range when satellite coverage is not available. Might be a good add-on for nations operating them wishing to extend their range beyond LoS to ground station without needing to purchase expensive and patchy satellite coverage.