G8OO Shack Antannas -- Elevation 59m or 194 feet ASL -- Antennas @ 7 mts or 21ft AGL

10001

Fan Dipole Or Multiple Band Dipole With A 1:1 Current Balun At The Feed Point.


The length chart below is shown as a single element.  (So you will need two legs/elements for it to be resonant)

10   meters              =     8.4ft                 = 2.56032m             x 2 legs/elements = 16.8ft or 5.120064m long
12   meters              =     9.5ft                 = 2.8956m
15   meters              =   11.1ft                 = 3.38328m
17   meters              =   12.1ft                 = 3.68808m
20   meters              =   16.8ft                 = 5.12064m
30   meters              =   23.2ft                 = 7.07136m
40   meters              =   32.9ft                 = 10.02792m
60   meters              =   43.7ft                 = 13.31976m
75   meters              =   60.9ft                 = 18.56232m
80   meters              =   65.6ft                 = 19.99488m
160 meters              = 123.5ft                 = 37.6428m

I built a 160/80/40 and below are the formulas that worked for me using solid core open copper wire.

The 160m both ended up being cut 4% shorter than the target 468 freq formulas.

The 80m and 40m both ended up being 4% longer than the 468 freq formula.

160m antenna 
(CW)   468 ÷ 1.843 X .96 = 243ft ÷ by 2 = 121.88 ft               = 37.149024m (fold-back 2.12ft or 0.646176m for SSB)
(SSB)  468 ÷ 1.810 X .96 = 248ft ÷ by 2 = 124.00 ft               = 37.795200m        

80m antenna
(CW)   468 ÷ 3.537 X 1.04 = 127.22 ÷ by 2 = 63.61 ft            = 19.388328m (fold-back 2.84ft or 0.865632m for SSB)
(SSB)  468 ÷ 3.662 X 1.04 = 132.90 ÷ by 2 = 66.45 ft            = 20.253960m        

40m antenna
(CW)   468 ÷ 7.040 X 1.04 = 66.47 ÷ by 2 = 33.23 ft              = 10.1285040m (fold-back 0.73ft or 0.222504m for SSB)
(SSB)  468 ÷ 7.165 X 1.04 = 67.93 ÷ by 2 = 33.96 ft              = 10.3510008m      

Useful links.

http://www.ku4ay.net/dipole.html
http://www.qsl.net/kd7rem/antdipole.htm
http://www.hamuniverse.com/multidipole.html
http://www.angelfire.com/nb/ni4l/ni4ldipole.html
http://www.arrl.org/tis/info/pdf/9611073.pdf
http://www.geocities.com/n2uhc/2banddipole.html
http://www.qsl.net/na4it/fandipole.html

By AlanH g8oo Monday, 05/02/2018