It's RTS 1, RTS 2, RTS 3, RTS HD (which is redundant since the 3 channels are already in Full HD), and then RTS 24/7, RTS Drama, RTS Archive, RTS Music, RTS Life, RTS Kids, RTS Music 2, RTS VOD and RTS SVOD, RTS [something I can't translate] (all names are translated from Serbian).
The TV service is the only one with HD terrestrial broadcasting, and yet it's production quality is absolute garbage (I mean literally, the video quality is absolutely terrible, I'm not even talking about the topics they deal with).
Basically, a money sink and waste of time. People who have SBB (United Group) watch N1 (CNN affiliate) in Full HD (with 30 Mbps bitrate, compared to 4 Mbps for RTS 1 HD).
People who don't have SBB cable, are stuck with the low level garbage channels from our state broadcaster.