A recent amendments by CASA now explicitly limits all recreational flyers to an altitude of 120m everywhere. They also now restrict recreational flyers from flying within 5.5km of an non-controlled aerodrome IF there is a manned aircraft operating to and from the aerodrome. To be clear this includes all Helipads without a control tower.
For further information please consult the CASA website regarding the use of Model Aircraft:
Use the 'Can I fly there?' apps to confirm you are allowed to fly in a particular area.