At the present time , as Creamy has pointed out, CASA has advised pilots that the correct frequency at these unmarked airports is the area frequency which is also used by ATC to separate IFR aircraft.
The ATSB also supports CASA on this!
It clearly shows the level of competence at each organisation.
Can someone give a name of the person at CASA who is driving this?
Or is there no individual who is responsible ? Sought of driven by group think and computer generated notams!