mjb
Not so sure about Ballina, however Hervey Bay Bundaberg Gladstone and similar places around the country are lucky to have any radar below 4000-5000 feet.
When you try to be active in the system on VFR FF and youare below 7500 there are big holes in places that surprise me and many others.
With no Mode C units at a minimum in many small bugsmashers in regional ports, the heavy metal guys will never see them if they stray into the path of a 737/320.
J