Here's the regulation (CAR 1988)
www.casa.gov.au/rules-and-regulations/current-rules260 Manned fixed balloons and kites (that means ALL kites not manned fixed kites)(1) Despite regulation 157, a person may fly a fixed balloon or kite at a
height not exceeding 300 feet.
(reg 157 is about low flying aircraft)(2) A person must not fly a fixed balloon or kite within 4 000 metres of an
aerodrome or at a height of more than 300 feet if the following
requirements are not satisfied:
(a) the person has CASA's permission to fly the balloon or kite at
that height;
(b) the flight is in accordance with the terms of that permission.
Penalty: 10 penalty units.
(I think each unit is about $110)(3) A person flying a fixed balloon or kite must fly it in V.M.C.
Penalty: 10 penalty units.
(V.M.C. = clear weather/ good visibility)(4) An offence against subregulation (2) or (3) is an offence of strict
liability.
Note For strict liability, see section 6.1 of the Criminal Code.
(5) This regulation does not apply to an unmanned fixed balloon or kite to
which Part 101 of CASR applies.
(when air traffic control is not in operation)Now ya know