80M Vertical Antenna with Capacitance Hat

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  80 Meter vertical antenna
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  Plot
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  SWR Pattern

• Simple wire antenna;
• Cheap to make, using readily available materials;
• Low angle radiation, with rejection of high angle signals;
• Wide bandwidth, with resonance at the 80M DX window (3.790-3.800 MHz); and
• Maximum height is 40 feet (limitation due to treeheight).

Design:

Since the use of a full ¼-wave vertical was out of the question because of space reasons, it was decided to use a smaller vertical, and load the top portion of the antenna with a capacitance hat. Based on modeling results, the following dimensions satisfied the design requirements:

Wire Lengths of Antenna Described for 3.800 Mhz

Wire Number     Length    Included Angle
    1                      11.89 m       (39') N/A
    2                      5.84 m        (19'-2") 29º
    3                      5.84 m         (19'-2") 29º