6 Element 20m Beam on 44ft Boom
Designed by Nathan Miller NW3Z
The VSWR is excellent across the band and was set as a high priority during the optimization process. A second model of the tapered antenna was run with double the segments and the results correlate very closely.
The front-to-rear was the top optimization goal. Across the band, the worst case front-to-rear lobe is 25dB.
Gain was sacrificed to achieve the other goals, however it is only slightly less than the 48' antenna. Such a small loss of gain is not even noticeable.
The following table shows the spacing of each element from the reflector, the diameter of each tapered segment and the length of each.
The taper schedule using the DX ENG sizes are as follows spacing diameter 1.0000 0.8750 0.7500 0.0000 72.0000 68.0000 75.1943 99.9100 72.0000 68.0000 66.9345 140.3200 72.0000 68.0000 57.8815 255.2700 72.0000 68.0000 47.3196 320.5900 72.0000 68.0000 45.7244 522.0000 72.0000 68.0000 39.8588