Telescopic whips and an old terminal block insulator make this open-stub J-pole for 70cm.
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| 70cm open-stub J-Pole Antenna |
The stub portion of the driven element is of 3/16" copper tubing (if only to make up for the shortage in length!).
The dimensions are: Driven Element - 495mm, Stub - 165mm and Spacing - 16.5mm.
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| 70cm open-stub J-Pole Antenna - Schematic |
The elements are wired to a BNC socket mounted on the block.
SWR at 435MHz is less than 1.5:1.
Related post: End-fed Sleeve Antenna for 70cm
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