What do manmade satellites look like through binoculars telescope?

I have been using the heavens above site to see when the Hubble, the Space Shuttle and the International Space Station will be visible from my location. Unfortunatly we have had a couple of days of clouds.
I have 15x70 and 7x35 binoculars and a 5.1" Meade telescope. How much magnification do I need before these satellites look like through binoculars telescope?show some shape?