Yes, the wire is 5.71ft+64.78ft = 70.49ft long. At 7.15Mhz, wl=137.56ft, therefore 70.49/137.56 = 0.512 lambda. Not 10.23%. The distance from the feedpoint to the short end is 5.71ft. 5.71/70.49 = 0.081 = 8.1% from the end. How are you placing the source. Remember that it has to be at the center of a segment. This is not necessarily some arbitrary percentage along a conductor. Did you use my segmentation or did you create your own? Again, here are the details of the three wires I am using to represent the antenna. The source is in the center of wire W2: You cannot model this as a single wire. If you are doing that, then your results will not match mine, besides wire #1 is the diameter of the coax it is made of. Ditto, except that I defined the antenna as lying along the Y-axis, not the X-axis. Which means you are not using my wires.