The file 'Box Balun 4:1 Vertical Antenna 9,7m 3D Printer Model' is (stl) file type, size is 9.4KB.
Custom made box for a 12mm diameter ferrite, 100mm long with 10 turns of 1mm wire. Simple 4:1 balun for a 9.7m long fishing vertical antenna. Works without radials from 40 to 6m
