radio satellites?self built packet radio?

[Gabriele Betti]

Hello,
I'd like to know if it is possible to self build a packet radio .
Is it less expensive than buying a new one?
I'd like to know even if I might be able to surf the net via radio satellites..
Are they supposed to let you a degree of freedom(let me choose a internet 
provider in another country, that let you surf via radio at 128 Kbp?
Thanks in advance for your answers,
Gabriele betti