Gerald,
Have a look at Jim's site, he supplies a live Brisbane SBS feed:
http://www.egph.co.uk/sbs.htm
He is away on holidays at the moment and will be back on 9 Feb.
As Pat mentioned, for you PlanePlotter is the way to go for local, interstate and international coverage. We have shares from FNQ, Brisbane, Sydney, Canberra, Melbourne, Hobart, Adelaide and Perth. In most of the capital cities there are two to three sharers feeding ADS-B plots. So if one is off line usually one of the others covers the area. It also depends on individual's range and coverage as to how close plots can get down to the airports.
Cheers,
Noel