http://www.forbesflatlands.com/the-competition.html

http://www.fai.org/download/CIEA/yac/7407_LocalRegulations-V2.pdf

Transceivers that may be used in Australia are 477 Mhz Australian
UHF CB band units, Airband (108-137Mz) radios or Amateur 2m band (144-148MHz)
units (see below).

· UHF CB radios must be approved for use on Australian UHF CB bands. This means
that the radios need to be approved to A/NZS 4365 and carry the "C" tick.

· 2 Meter Amateur band radios may be used only by qualified Amateur operators on
authorised amateur band frequencies only . Operators should bring a copy of
their qualification to be shown on demand.

· All users of Air Band radios must hold the appropriate Air Radio Operator
qualification.

The previous rule:

http://ozreport.com/forum/viewtopic.php?t=29195

Radio transceivers are required. The only radio transceivers that
may be used in Australia are 477 Mhz Australian UHF band and Airband radios. 2
Meter radios are not legal for aviation use in Australia.