This is the plan that I used to build my J-pole antenna. If you follow the cuts exactly as listed it works well. I’ll post the photos of the results. I 3D printed the coax connection point for a stronger connection to the antenna. One of the pipe clamps used is connected to a screw on the ground side of the so239 and on the driven element side I left the so239 screw out on one corner so that I had a clear path from the center pin to the screw on that clamp. The plans can be found online and was created by Michael Martens, KB9VBR who has his own YouTube channel at KB9VBR Antennas.
73
Matt, KB9HUO
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