Ah well, just to add one more....
Working away in KG FSU a couple of 'late afternoons' when aircraft 'EXN' or something called at 30 miles inbound.....
Now, I had nothing on any 'EX?"s at all, but I did know that in those days, the aircraft whose regos commenced with 'EX?" were usually 'Aero Commanders'....and while I was checking with Flight Data, MILDURA FSU answered, and gave the 'usual responses'....
So, I simply called Mildura on the 'common' VHF, 122.1, & and we agreed to ignore any callsigns that we knew were not 'ours'.
This situation lasted for about an hour or so, and then simply 'faded away'...
Happened a few times, but right now I cannot remember the time of the year.
'Amusing' and interesting at the time....
Cheers
Similarly, on more then a dozen occasions it would appear that KG FSU was the only unit able to hear aircraft at Moruya / Merimbula (?), S. NSW, apparently, on 8mhz HF calling SY for cancellation of SAR....5 x 5......at around 'evening time' KG.
Who do you call now...? 'Mum' on ya I-phone....