@AArkley,
Yes, that is very similar to RODAR. Since the HeliRadar is a relatively recent system one developed in association with Eurocopter I have to assume that many of the challenges mentioned above have been addressed. Now to have the antennae integral with the rotor itself, I have no doubt that DARPA or some other entity is working on it.
BTW, it would have been nice of you to indicate the segment which mentioned the HeliRadar was @ 41:44, it would have saved me and possibly others from watching the entire video. Thank you though for sharing.