This is a modification to Photonix's antenna that skeins better than the original. I imported his STL into Sketchup and replaced the faces with the letters with flat surfaces. SFACT was filling in solid layers where the letters protruded (about half of the object). Please see Photonix's thing http://www.thingiverse.com/thing:19548 for directions and rod lengths. 'A' is on the rear side of the hole for the transmitting element. 'B' through 'F' continue in order to the end. SFACT chucked an error at me during one of the layers, but it printed well nonetheless. I have yet to try it, but I will update when I have results. This printed well on my Makergear Prusa with the fill down to 0.15 (natural PLA).