Australian spectrum allocation arrangements are, at their broadest level, embodied in one statutory instrument known as the Australian Radiofrequency Spectrum Plan (ARSP). The Spectrum Plan divides the Australian radio frequency spectrum into a number of frequency bands and specifies the general purposes for which the bands may be used.
In the United States, business band radios operate in UHF frequencies of 450 – 470 MHz and VHF frequencies of 150 – 162 MHz. Both 450 – 470 MHz and 150 – 162 MHz are usable in Australia for various communications purposes which are listed in the ARSP (the Spectrum Plan). A link to the ARSP can be found at this link: http://www.acma.gov.au/webwr/radcomm/frequency_planning/spectrum_plan/aust_rf_spectrum_plan.doc.
To use these radios you would require a license to operate a radiocommunications transmitter in Australia including in the 150 MHz – 162 MHz and 450 MHz – 4 70 MHz sections of the spectrum. Under the Radiocommunications Act 1992 all radiocommunications transmitters in Australia must be licensed. There are 3 types of radiocommunications licenses in Australia, they are Class licenses, Apparatus licenses and Spectrum licenses. More information on these 3 types of licensing can be found at here: http://www.acma.gov.au/WEB/STANDARD/pc=PC_481 Radiocommunications licensing.