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In a set of xv-25 stealth suits... What the hell is that little antennae thing?? Is it their homing beacon? Is it a marker light? Is it a multitracker? Bear in mind I haven't received my new tau codex yet, but the old codex seems to be of no help. I just wanna know what it is because in the GW pictures it always shows the squad with it on a separate base... I just wanna I know what it is

It's purely decorative. The most common uses are either as a conversion bit, or an objective marker.