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Copper Cactus multiband J-Pole antenna

Homebrew a j-pole 2mt and 70 cm antenna project. Make it cheap. This article includes homebrewing instructions, parts lists, tools needed and printable documentation.

Plans and drawings of common amateur radio antennas, like jpoles, copper cactus, super jpole, omnidirectionals and quads

Original article published on February 1992 on 73 Amateur Radio Today about the 2m and 70 cm copper cactus J-pole antenna

A J-pole antenna plan made using a half inch copper tubing

Single Coax Feed to Multi-Band Copper Cactus Antenna.

An interesting article on how to make copper cactus J-Pole antennas

This is the construction of a copper cactus style j-pole antenna.

Details the construction of a Copper Cactus Dual-Band Super J-Pole Antenna, providing specific measurements for 1/2-inch copper tubing sections, including a 57-1/2-inch long section and a 19-inch short section, along with a 42-inch piece of 3/16-inch or 1/4-inch soft copper tubing for the matching stub. It covers soldering techniques for copper fittings, drilling an SO-239 panel mount coaxial fitting, and securing feed point connections with stainless steel adjustable band clamps. The resource specifies materials such as Schedule M 1/2-inch copper tubing, various copper fittings, a hardwood dowel or Fiberglas rod for insulation, and #14 stranded copper wire for the feed point. The guide simplifies the J-pole feed point by using an SO-239 fitting with an elongated mounting hole and band clamps, noting an optimal feed point distance of approximately 3 inches above the crossbar for proper impedance matching. It recommends a 4-turn coax choke, 5 inches in diameter, placed within 3 to 4 inches of the feed point for 2-meter operation to mitigate RF on the feedline. The project emphasizes weather sealing with silicon or butyl rubber compound and clear lacquer for durability and appearance.