Amateur Radio Antenna And Feed Line Specifications

This page is dedicated to length specifications for dipoles, folded dipoles, inverted V's, verticals, ground planes, quad loops, delta loops and extended double zepps.  You will also find feed line lengths to SWR match the band.

Choose from the list below or browse the whole page:

1/2 And 1/4 Wave
1/4, 5/8 and 3/4 Wave Vertical
1/2 Wave Dipole, Beam, Inverted V, Collinear Array and Extended Double Zepp
Full Wave Quad and Delta Loops

1/2 And 1/4 Wave

BAND AND MODE Center Frequency (MHz) 1/2wave in space (ft) Feed (Coax/Balanced) (ft) 1/4wave in space (ft) Feed (Coax/Balanced) (ft)
6 Meters CW/SSB 50.100 9.82 6.68/8.05 4.91 3.34/4.03
6 Meters FM 52.525 9.37 6.37/7.68 4.68 3.18 /3.84
           
10 Meters CW 28.050 17.54 11.75/15.44 8.77 5.88/7.72
10 Meters SSB 28.450 17.29 11.59/15.22 8.65 5.79/7.61
10 Meters FM 29.600 16.62 11.14/14.63 8.31 5.57/7.31
           
12 Meters All Modes 24.920 19.74 13.43/16.19 9.87 6.71/8.09
           
15 Meters CW 21.060 23.36 15.65/20.56 11.68 7.83/10.28
15 Meters SSB 21.300 23.10 15.48/20.33 11.55 7.74/10.16
           
17 Meters All Modes 18.110 27.17 18.47/22.28 13.58 9.24/11.14
           
20 Meters CW 14.060 34.99 23.45/30.79 17.50 11.72/15.4
20 Meters SSB 14.220 34.60 23.18/30.45 17.30 11.59/15.22
           
30 Meters CW 10.120 48.62 33.06/39.87 24.31 16.53/19.93
           
40 Meters CW 7.025 70.04 47.62/57.43 35.02 23.81/28.71
40 Meters SSB 7.225 68.10 46.31/55.84 34.05 23.15/27.92
           
80 Meters CW 3.600 136.67 91.57/120.27 68.33 45.78/60.13
75 Meters SSB 3.875 126.97 85.07/111.73 63.48 42.53/55.87
           
160 Meters 1.840 267.39 181.83/219.26 133.70 90.91/109.63

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1/4, 5/8 and 3/4 Wave Vertical

BAND AND MODE 1/4wave Vertical (ft) 1/4wave Groundplane Radials (ft) 5/8wave Vertical (ft) 5/8wave Groundplane Radials (ft) 3/4 wave Vertical (ft) 1/8wave Groundplane (ft)
6 Meters CW/SSB 4.67 5.50 12.04 4.67 14.49 2.34
6 Meters FM 4.46 5.25 11.48 4.46 13.82 2.23
             
10 Meters CW 8.34 9.82 21.75 8.34 25.88 4.17
10 Meters SSB 8.22 9.68 21.44 8.22 25.52 4.11
10 Meters FM 7.91 9.31 20.61 7.91 24.53 3.95
             
12 Meters All Modes 9.39 11.06 21.20 9.39 29.13 4.70
             
15 Meters CW 11.11 13.08 28.97 11.11 34.47 5.56
15 Meters SSB 10.99 12.94 28.64 10.99 34.08 5.49
             
17 Meters All Modes 12.92 15.21 33.30 12.92 40.09 6.46
             
20 Meters CW 16.64 19.60 43.39 16.64 51.64 8.32
20 Meters SSB 16.46 19.38 42.90 16.46 51.05 8.23
             
30 Meters CW 23.12 27.23 59.58 23.12 71.74 11.56
             
40 Meters CW 33.31 39.22 85.84 33.31 103.35 16.65
40 Meters SSB 32.39 38.13 83.46 32.39 100.48 16.19
             
80 Meters CW 65.00 76.53 169.47 65.00 201.67 32.50
75 Meters SSB 60.39 71.10 157.44 60.39 187.35 30.19
             
160 Meters 127.17 149.74 327.72 127.17 394.57 63.59

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1/2 Wave Dipole, Beam, Inverted V, Collinear Array and Extended Double Zepp

BAND AND MODE 1/2wave Dipole/Vertical (ft) 1/2wave Reflector (ft) 1/2wave Director (ft) 1/2wave Folded Dipole (ft) 1/2wave Inverted V
(ft)
Collinear Array
(ft)
Extended Double Zepp
(ft)
6 Meters CW/SSB 9.34 9.81 8.92 9.22 9.68 19.16 24.07
6 Meters FM 8.91 9.36 8.51 8.80 9.23 18.28 22.96
               
10 Meters CW 17.52 17.52 15.93 16.47 17.29   44.90
10 Meters SSB 16.45 17.27 15.71 16.24 17.05   44.27
10 Meters FM 15.81 16.60 15.47 15.61 16.39   42.55
               
12 Meters All Modes 18.78 19.72 17.93 18.54 19.46 38.52 48.39
               
15 Meters CW 22.22 23.33 21.22 21.94 23.03   59.81
15 Meters SSB 21.97 23.07 20.98 21.69 22.77   59.13
               
17 Meters All Modes 25.84 27.13 24.68 25.51 26.78 53.01 66.59
               
20 Meters CW 33.29 34.95 31.79 32.86 34.50   89.58
20 Meters SSB 32.91 34.56 31.43 32.49 34.11   88.57
               
30 Meters CW 46.25 48.56 44.16 45.65 47.92 94.86 119.17
               
40 Meters CW 66.62 69.95 63.62 65.77 69.04 136.65 171.67
40 Meters SSB 64.78 68.01 61.86 63.94 67.13 132.87 166.92
               
80 Meters CW 130.00 65.00 136.50 128.33 134.72   349.87
75 Meters SSB 120.77 126.81 115.34 119.23 125.16   325.04
               
160 Meters 254.35 267.07 242.90 251.09 263.59 521.74 655.43

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Full Wave Quad and Delta Loops

BAND AND MODE Fullwave Quad Loop
(ft)
Fullwave Quad Loop Reflector (ft) Fullwave Quad Loop Director (ft) Fullwave Delta Loop
(ft)
Fullwave Delta Loop Reflector (ft) Fullwave Delta Loop Director (ft)
6 Meters CW/SSB 20.36 21.38 19.44 20.36 21.38 19.44
6 Meters FM 19.42 20.39 18.55 19.42 20.39 18.55
             
10 Meters CW 36.36 38.18 34.73 36.36 38.18 34.73
10 Meters SSB 35.85 37.64 34.24 35.85 37.64 34.24
10 Meters FM 34.46 36.18 32.91 34.46 36.18 32.91
             
12 Meters All Modes 10.93 42.98 39.09 40.93 42.98 39.09
             
15 Meters CW 48.43 50.85 46.25 48.43 50.85 46.25
15 Meters SSB 47.89 50.28 45.73 47.89 50.28 45.73
             
17 Meters All Modes 56.32 59.14 53.79 56.32 59.14 53.79
             
20 Meters CW 72.55 76.17 69.28 72.55 76.17 69.28
20 Meters SSB 71.73 75.32 68.50 71.73 75.32 68.50
             
30 Meters CW 100.79 105.83 96.25 100.79 105.83 96.25
             
40 Meters CW 145.20 152.46 138.66 145.20 152.46 138.66
40 Meters SSB 141.18 148.24 134.82 141.18 148.24 134.82
             
80 Meters CW 283.33 297.50 270.58 283.33 297.50 270.58
75 Meters SSB 263.23 276.39 251.38 263.23 276.39 251.38
             
160 Meters 554.35 582.07 529.40 554.35 582.07 529.40

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