Hi,
You will need to install a quad lnb on your satellite dish, this enables up to 4 boxes to one dish, about eur40. You will then need to run a seperate cable from dish to the second box. With this box you can view the free to air channels, ie BBC(ALLDIGITALCHANNELS) ITV Digital channels, sky news cnn and many more. The easiest way to receive these channels is to go to sky news and press red button, when sky news interactive screen appears, put in a card into the sky card slot, eg atm card or credit card. press back up, when you are out of interective screen, your epg should red ch101 bbc1 london, ch102 bb2 england, ch103 ITV midlands, plus itv2,3 and4 and many more.
if you want ch4and ch5 plus sky3, i suggest you google for a free to view sky card or visit ebay.ie
Remember non of the above will get you any subscription channels for free. That would be illegal!!