it is a little box about the size of a dvd case (but thicker). here is what you need to hook up:
AC plug into the wall
ethernet cable into your router
coaxial cable (the one you plug into your tv) into the unit
this is all you need to do to get it to work. you can also have an output from the box back to your TV, so you can watch a tv on the same line. the box pretty much acts like a tv with a built in tuner. it is very simple to set up.
then you will need to set it up through your computer for internet broadcast. it pretty much sets an IP address for the box and runs through a video setup thing. it is all in a wizard with the installation cd. its all pretty simple.