UTube contributions Amplifiers, great explanationhttps://www.youtube.com/watch?v=YuVqccvgNPM VK4 122GHz record.https://l.facebook.com/l.php?u=https%3A%2F%2Fyoutu.be%2FQzw6W7OARcM&h=AT3xDbe4P0rlIo1FewNcisvR3kBXp1TGZHJIrn9y08f-dBTLGx8JlFZIhYufKgLBc3g8wIidYefYg3ENwFqG8pE1c3KzWGWy5v5mJ8zr1mASzNKKHyaiJyS2wUJMhcvo8zYUHs-6FoqcM7w VK4OE explains Parablic Dish design and how they work. :See here.