Great stuff Gaunty.
Sorry to disappoint, but the good ol' boys at Darwin HF have been in Brisbane for a while now, and before that they were in Perth.
Still get people transmitting AM on HF, my FS spies tell me, sounds like an enraged duck from our end. I have no idea what it sounds like when they tell them to change to USB, but it works sometimes.
The squeally-horrible stuff you hear when 2 stations transmit together on VHF is the carriers heterodyning with each other, multiple stations on USB really do sound like people talking over each other, and can be understood. It would a huge improvement to safety if we only used SSB on VHF.