Australia only… do i need a digital antenna for a digital settop box ?
First off I am not Australian but American. Thank you for disclosing where you are to get the proper help. So here goes. A specific digital antenna is little more than marketing, as it will be compatible with the UHF freqs. What you need is a good antenna, outdoor is always superior, with directional element antennas being the best of these, usually these require professional installation ( as the direction is critical) but the results are excellent. Now the absolute best antenna is a directional tuned element, meaning the individual antenna elements are wavelength( λ ) tuned to the broadcasters in your area and directionally tuned, to provide the best impedance (Ω) coupling of a signal for the absolute best possible signal. this would be a large antenna costing several hundreds to install and tune, but you will never need another antenna for anything. Look to local radio and TV shops to get you in the right direction for a supplier of one of these. Short of that your recourse is cable
