Pioneer 10!  I always imagined this thing to be huge in real life from the images I saw of it heading out of the solar system.  It turns out the main dish is only something on the order of 6-8ft. 

This too is one of Ton's designs and can be found here. I should have made the reactor supports and the low gain antenna supports stronger.  Other than that it is a very pleasant build.

Click on the thumbnails for larger images.