There is no difference to all of them including any home ones, those that talk of twin tuners is all rubbish, as one can only have 1 EPG in a tuner and all programs sit within the EPG for not too technical speaking.
In other words you are tuned to BBC1 in the say a group A TV station and you drive to another town that use group B, you will have to retune completely to get the BBC1 in group B, then retune again when you get home again, for any EPG can only handle 1 off BBC1 and has no where to put the extra BBC1.
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