I think you may be a bit confused there. You won't get any hd channels via a sky + box, you would need a sky hd box. You can plug you freesat tv into your sky satellite dish to get BBC hd and itv hd via freesat. If you want freeview hd you would need a freeview hd set top box and plug it into your regular Aerial (presuming you are in an area where you can get freeview hd).