A friend of mine got an article published in the September 2005 issue of QST Magazine describing how to build an 80M DF receiver and asked if I would be interested in supplying kits. The supplier of the circuit boards told me he had maybe a half dozen or so calls for the circuit board. I sold about 40 kits of which about half were ordered assembled and tested. FWIW, about half of those that ordered the unit were using it for interference tracking with the remainder using it for direction finding. Another friend of mine designed a single board computer and put it up on his website; I don't know if anyone has ordered a board or built it. I am planning on being at the Dayton Hamvention this year to sell DF equipment, and it will be *very* interesting to see what kind of a response I get. Of course, I also plan on checking out the 2000+ vendors for any classic computer stuff too :).