Australian OTH radar network.
Jindalee Operational Radar Network - Wikipedia, the free encyclopedia
It is possible the network tracked MH370, but it takes time to sort out the radar track and again we can't expect them to reveal too much information that will reveal the capabilities of a sensitive military system. Behind the scene, they are probably using undisclosed sources to help with the search. How about sending a SSN to listen for the black box pings?