If its a Sky+ box you will need a twin LNB and 2 coax lead ins
You will not be able to use the Sky+ record,pause.rewind without a Sky+ dedicated card and subscription but for some reason you can use the wrong card for the box and the Sky+ features will work I find
That is academic as I understand you have discontinued the subscription
You can pick up Sky boxes for £5 at car boots or maybe a Sky freeview box
You can receive a lot of channels without the Sky card including BBC 1,BBC2. ITV,Sky News etc
OK I've just tried it on our system which is HD box in one room and Sky plus box in another room with multi room subscription and Sport and Movies
If I remove the Sky+ card from the Sky+ box I can get BBC 1,BBC 2, ITV.Ch4 ( not CH 5) and Sky News that I have tried
IF I put the card from the HD box into the Sky+ box I can then get Ch5 as well
Also all Sky+ record etc facilities work on the Sky+ box with the wrong card and Eurosport works as well but not the Premium channelsl
Hope that helps