I presume that you are in Australia and this is where you purchased the TiVo.
The tuner in the unit you show is an American NSTC type. Your TiVo has probably been used in conjunction with a settop box or satellite tuner.
If you go to here http://www.oztivo.net/twiki/bin/view and do a bit of reading all will be made clear. Note the PTV300 is a Sreies 1 not the TiVo HD digital tuner model from retail outlets in Australia. In many ways a series 1 is a more flexible device!
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