Question

Why is the satellite dish still needed?

Answer 1

Sky has recently announced that starting in 2018, the company will be offering a dish-less service through their Sky Q. Until then, however, you still need a satellite dish for a Sky subscription, although there are some workarounds

Answer 2

1)to gather the radio wave
2) the parabolic shape of the dish reflects the
the signal to the fish's focal point.
3)the feedhorn is essentially the front end of wave guide they gather signal at or near the focal point and conduct to a low noise block downcoverter or LNB
4)the dish help to collect radio wave send by station and reflect this to antenn.