Might take some doing, sling box or not. Doesn't Australia use a "unique" 7MHz bandwidth for OTA, which would in turn affect their sat feeds? And not being NTSC may be a problem also. 50 Hz refresh?
Getting a direct sat feed, no. Your dish would have to be VERY sensitive and aimed into the ground.
Some of us would love to get UK feeds- AFAIK, no one has devised a good way.