could anyone let me know what setup i need to get freeview, i have a roof aerial , and a box which lets you know the signal strength, green for strong, red for weak. With the aerial extended, turned in every way possible, the green light on, TV autotuned, all i get on every channel is NO SIGNAL. Do i need a freeview aerial, if so will my existing aerial be any good. any help would be a bonus . I do not have satalite.