Not sure about Australia, but in the US there is no such thing as a digital ofrHD TV antenna. Any claims are simply a marketing
ploy. For here at least, as I said in a previous post, to pick up our digital signals you need any antenna that receives UHF and since some digital broadcasts are still done in VHF
here the ability to pick up UHF and VHF
is useful. Our Shakespeare omni directional sitting on a mast
20 feet off the water
picks up stations at 60 miles away. It does have the signal booster and I would recommend it if you are trying to get a signal some distance away. Here in the Chesapeake we can pick up all of the Baltimore
digital and HD stations with a coat hanger.