The aerial is required for the two terrestrial tuners in the box to work, without, it's basically useless.
If you want to use your TV's tuners you need to connect the boxes rf out to the TV and turn off power saving in sby. The only other connection you need is is a hdmi cable for an HD TV or a scart cable for a SD TV that's it.
If you think it's a satellite box you are looking at the wrong box, the satellite one is the Foxsat-hdr.