To establish exactly what is 'White Space', as opposed to occupied channels, look up the following PDF databases as published by the Australian Communications and Media Authority (ACMA).

 The data comes in two exciting flavors...

TV stations by channel order.

TV stations by location.

In general terms, the Australian UHF TV spectrum is currently 520 to 820 MHz.

The VHF band is virtually unusable nowadays, except for some minor segments.