Just thought you all might want to know, be VERY carefull when buying a tracking setup as there are strict Australian rules as to what is legal.
Ask the seller if they carry the "C" tick on them as these are the ONLY ones that are legal, as an example, the ONLY legal collar that comes from USA is the wildlife one. If someone tells you they can "import" them for you, ask them if they are a registered radio gear importer, could be cash going down the drain so be carefull.
Bob