I was amazed when first arriving to Australia 25 years ago how little SAM coverage the top end had. Many years later i'm still surprised.
Was always inpressed with the Bloodhound gate gardean at RAAF Darwin though.
It wouldnt be hard to get off the self gear though Patriot/Arrow - S300/400 anybody?
Or do we allready have the gear and its sitting in one of the underground bunkers in the Blue Mountains