There are all kinds of amateur radio satellites, and it kind of depends on what you want to do. Hams talk through them all the time, chasing grids for awards or

There are all kinds of amateur radio satellites, and it kind of depends on what you want to do. Hams talk through them all the time, chasing grids for awards or just seeing who's out there. Getting outside of amateur radio, I understand that Brazilians have made creative use of some kind of US Navy satellite but I don't recall the details...