Well, I mean, the DJI drone must have the radio to be sending its own video stream back to HQ, which -- and maybe this is an invalid assumption, dunno what Ukrainian drone tactics are like -- I assume is probably co-located with the loitering munition operator. It looks like that stream is at least as high-bitrate as the munition's stream.

Even if they aren't co-located, I'd assume that they're in a position to communicate with each other.

So all it needs is the ability to pick up the munition's stream, and they have line of sight with each other (necessarily, if one is videoing the other).