What’s the chances of these UFOs filling our skies being *responding aliens* when you consider: 200 light years of radio signals is like dropping a pebble in the centre of the Pacific Ocean and creating a concentric wave of 10 centimetres diameter?

What’s the chances of these UFOs filling our skies being responding aliens when you consider: 200 light years of radio signals is like dropping a pebble in the centre of the Pacific Ocean and creating a concentric wave of 10 centimetres diameter?