Scott, Bob, W5OE (a.k.a. Mr. Alford) is a good resource for Alford slot antenna as he actually builds and uses them (when he's not designing hybrid auto engines). Check out these links. http://www.k5rmg.org/Alford-slot.html http://www.k5rmg.org/docs/Alford-slot.ppt 73, Jim K0MHC