It's an IPTV stream (not antenna) hence all the talk of being "on wifi" on the website, but currently it's all wrapped up in a custom app which is only available on the latest-generation TV's. I've seen things written about it being 'open' but then cannot find any technical details and if it's truly open I'd expect it's requirements/methods to become public fact fairly quickly. The one thing I noted from reading around was that it's not possible to record live TV using the app; which would be achievable with Tvheadend providing some kind of intermediate role. No idea though.
To be continued..