Mate, just have a quick hunt around google for home made radio telescope antenna and related, you will be amazed at the things you have in your shed that can tune in to the stars! I have just found out that there is a pci card that can do the job, or if you have a laptop, there is an external usb device, about the size of a sandwich, to convert ur pc into a reciever for the stars!
Heres a pic of another blokes attempt. works well.
Cheers,
Barry
