Copper J Pole for 2M

J-Pole copper

Notes: 1. When mounting on metal mast, use a pvc pipe insulating sleeve between base stub on antenna and the metal mast, hose clamp to the mast, then attach copper ground wire to the exact center of the shorting bar for DC ground.  This will prevent the RF from coupling to the mast and upsetting the radiation pattern and the match to the feedline.

2. Use a ferrite bead choke on the feedline to prevent RF common-mode current traveling on the braid and radiating.