I'm in Australia too. I think we use 900mhz for mobile phones so i would say there is going to be allot of interference. Not sure about 1.3GHz but 2.4Ghz has wireless internet all over the place while 5.8Ghz is expensive. Isn't the 3G network on 1.2GHz??? would the separation of 1.2GHz to 1.32GHz be sufficient?
Also not that i'm really going to abide by our nanny nation's laws but what is the max power output we are allowed to posses? Anyone in Australia had a 900MHz around the city areas? do they have problems with the mobile towers?