![]() ![]() These antennas can easily be built for UHF or above by using a chassis mount N-Type (or SO-239) connector, some solid wire and solder. You could cut a little on the large side and trim the antenna for best match at your desired frequency if you have the equipment. The velocity factor is set to 95% which should be fine for most people. This is a true unbalanced antenna, with a feed impedance of around 50Ω and therefore a great match to 50Ω unbalanced feedline. ![]() There are usually four radials, three being a minimum, but you could use up to six. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. Ahh, the good old quarter wave ground plane! This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. ![]()
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