Bad advice creamy. There are many places in Australia that a call from low level on an " area " frequency will get you no reply.
That's why I leave my second radio and mic selector on 121.5 guard frequency. Testing in Australian and around the world has always shown an instant response from a high flying airline aircraft.
That's why the origional NAS document listed 121.5 as a suggested appropriate frequency to monitor for VFR traffic.
And there is no "Dicks problem" to solve. The correct frequency to use at unmarked airstrips is 126.7. There is simply no way of knowing the "area" frequency under the FAA NAS as there is no such thing. The origional charts sent out with the cabinet approved NAS changes specifically deleted the frequency boundaries as they are there for ATC workload purposes - not VHF coverage reasons.
It became the stuff up which it now is because people at RAPACs and Bernie Smith could not accept that VFR flying at different levels to IFR could provide an acceptably safe system. They demanded the boundaries be re introduced however gave no advice how such a unique system would work.
In fact it doesn't - that's why just about every pilot ignores the CASA NOTAM .