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J - Pole Antennas |
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Enter frequency in the block and then click on the "Update" bar. |
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A J-Pole is an Omni directional antenna. It consists of a element that is 3/4 wavelength long and a 1/4 wavelenght element, that are tied together (shorted) at the bottom. The coax is connected a little up from the shorted element. The center of the coax is terminated on the longest element. The most common J-Pole is the Copper Cactus (made out of copper water pipe and looks like a cactus). They are also made out of twin lead and other materials. They are are easy to build and work great! |
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Twin Lead J-Poles Make J-Poles out of TV twin lead. These make a good EM-Comm portable antenna. They roll up into a small package. Make several to take with you in you Go-Kit. |
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6M Ladder Line J-Pole Construct a 6M J-Pole sing 450 ohm Ladder Line. |
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