Greg, if you open a map of the whole of Australia, you will be able to see the areas covered by ADS-B private feeders. Currently the area from Cairns all the way around to Adelaide is displayed plus Perth, Darwin, Alice Springs and some regional areas.
Bear in mind that the ADS-B signal is transmitted at 1090 MHz and is "line of sight", the average maximum range is about 200 nm depending on the feeder's antenna setup. The signal can also be blocked by terrain or buildings near the feeder's location. Sometimes areas drop out if the feeder is of line for a period.
Things are on the improve as more feeders are coming on line and more a/c are being fitted with ADS-B equipment.
Hope this helps to explain the situation.
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Cheers,
Noel White
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