That's a fascinating project to read about. The Australians currently have the world's best OTH radar from what I can tell, the capabilities of their system are

That's a fascinating project to read about. The Australians currently have the world's best OTH radar from what I can tell, the capabilities of their system are incredible. There's a nice video on Youtube of some Russian teenagers climbing up the Duga radar and walking along the top of it, it isn't for the faint hearted.