There is a cool gadget that I would like to get, though like most of my other cool gadget dreams, it’s priced outside my budget. It’s called the Universal Software Radio Peripheral. In a nutshell, with the right modules you can receive and transmit at any radio frequency from straight DC to 2.9Ghz. I don’t think it’ll do the entire spectrum at once, as there aren’t enough slots on the motherboard for that many modules.
To have this machine, all the modules, and the time to play with it would be FUN.