The Wheel

Has anyone built there own TEMPEST reciever/antenna equipment? I have seen articles that say that you can use old television sets, and that you can build more advanced TEMPEST unit for a hundred dollars. This seems akin to the carburator that will give you 200 mpg, and plans for a particle beam cannon in the back of some zines. If this is so cheap and easy or cheaper-quicker-better (NASA-Goldin-TQM propoganda), then why haven't we seen an article/articles on the construction of a TEMPEST reciever and the associated tuning/specs on such an item. Is it possible, or nothing more than snake oil? JPW