It is not possible to plug an aerial into a Sky Digibox to receive Freeview channels because the boxes have not been designed this way.
You will continue to get the full Sky EPG listings; you just will not be able to watch subscription channels.
If you have an HD-Ready TV and a standard Sky box, this is a good option.
Can you use a sky box as a Freesat box?
Can I use my Sky box (or another receiver) to get Freesat? If you have a Sky box and dish, you’ll be able to receive around 200 free-to-air channels without a subscription. Most of the channels on Sky’s Freesat service are the same as those on the BBC/ITV Freesat service, but not all of them.
Does your sky box still work without subscription?
I have a Sky+ box that is only used for recording. When you cancel your subscription your Sky+ box will still work and using your now deactivated viewing card you will still be able to receive a handful of unencrypted free-to-view (FTV) channels, including BBC1, 2, ITV1, C4 and C5.
Are old sky boxes any use?
Your old Sky box will still work as a Freesat from Sky box to receive free channels on it, but you won’t be able to pause, record or watch any old recordings on the box anymore. Alternately you can give it to friends or family who want a Freesat box, or sell it on eBay (don’t expect to get much for it).