Of course it can detect "stealth" - or, rather, small RCS objects. The Jindalee is a typical OTH. The Duga has an even lower frequency diapasone. A 350 MWt Daryal station would be superior to Jindalee in most regards - 6000 km distance at full power - but that shouldn't be too much of a wonder, a Daryal is probably the most powerful radar in the world - even the massive Don-2NP is only 250 MWt.
FYI:
1st Generation OTH (Dnepr): 1m^2 RCS at 2000 km
2nd Generation OTH (Daryal): 0,1m^2 RCS at 6000 km
3rd Generation OTH (Volga): 0,01m^2 RCS at 5000 km.
That's why radars of the JORN, Daryal, Don and Volga stations can detect stealth objects. Raptors, B-2s and F-117s, F-35 have RCS between 0,01-0,03 m square, which is detectable by such a radar.
Another issue is tracking a stealth aircraft or guiding weapons to kill it. OTHRs cannot do that (neither can they track weapons to kill versus normal bombers or fighters, anyway) - unless you fire a salvo of nuclear ABMs, he-he.
Precision in tracking and guiding is far too great in OTHs, a small craft would be shown as 10 km wide which is mostly pointless for a weapon system unless it's a nuclear warhead.
P.S. The Don's ability to track objects in space at high altitudes is unparalleled though. It was the only radar in the world which detected 5cm metal balls in orbit - all other only managed to grasp 10 and 15 cm balls. It's precision also allows for rather efficient ABM firing. Still hard to use it against non-ballistic targets, but as a EW radar, it is very good. Especially with the 360 degrees
