This is a 4 element Yagi antenna for the 440 MHz frequency. I have added an initial SCAD document to attempt parameterizing the creation of the element spacing. NOTE There is a limitation on the frequency that the SCAD document. Do not use any frequency above 440 MHz as it will bork the calculations. NOTE Customizer WILL NOT work with the parametric SCAD file. The only way to customize this part is through OpenSCAD at the time of this note, and should things change so will this note.There are three pieces to this project. The total count of printed parts are: (1) 440Element_End.stl (2) 440Element_Segment.stl (1) 440Element_Mount_Tap.stl Suggested printing with 0.300 mm layer height and 20% infill {Shown in Picture} Once all required pieces are printed, set the notch connector into the end of the next segment and tap together with a hammer. Do Not haul off and really hit the printed parts as they will shatter. A gentle tap until the pieces sit together is more than enough. The order of assembly is shown in AssemblyOrder.png. Essentially: Segment > Mount_Tap > Segment > End I used metal coat hangers for the actual elements and their lengths are {inches | mm}: Reflector Segment {13.27" | 337.058mm} Driven / Mount_Tap {12.87" | 326.898mm} Director 1 Segment {11.915" | 302.641mm} Director 2 / End {11.915" | 302.641mm} The Mount_Tap section is a small bit tricky if you have never messed with a yagi before. The element does not run all the way through the support. What I did here was slightly bend one end of the hanger, then start it through the support hole on the side of the segment. Then once it was in the larger hole, I used a wood screw to push the end further down the hole, and ensure that the end was bare metal. From here one wire {ground or center} of the coax cable is attached to the screw, and then finish tightening the screw. This makes one connection, or tap, to the antenna. Repeat on the other side. Once the center taps are secured, trim the ends of the hangers to length. For all other elements, measure out the appropriate length of wire, then put a small bend in the middle. Push the hanger through the support until it has even amounts of wire showing on either side. The bend will hold the element in place! NOTE Always check your antenna using an SWR meter before attempting to transmit using any home made antenna, your transmit amplifier will thank you. Edit I went in and put the proper terms for each segment above. I realized that I was probably causing confusion with what I named things for ease of the print files.