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The measurements below are for building a half wave dipole using wire . The wire size may range from 16 AWG to 12 AWG . The lower the wire number the wider the bandwidth . For example 12AWG will have a lower swr ( Standing Wave Ratio ) over a greater frequency range than 16 AWG .

The measurements below are in feet and inches . I have rounded off some of the measurments so it will be easier to measure them .
The diagram below is a representation of a ( Flat Top dipole ) . A flat top has a feed point impedence of about 72 ohms .

It is one half wavelength of a full wave antenna .

The green arrow is the 1/2 wave length measurment of the antenna .

The red arrow is the 1/4 wave length measurment of one half of the 1/2 wave dipole antenna .

The orange center is the representation of the coax connection .

The formula for figuring a half wave dipole is " length = 468 divided by the frequency in megahertz .
Operating
Frequency		1/2 Wave Antenna Length1/4 Wave Antenna Length
160 Meters
1.8 Mhz.260 Ft.130 Ft.
1.9 Mhz.246' 3 3/4"123' 2"
2 Mhz.234 Ft. 117 Ft.
80 Meters
3.5 Mhz.133' 6 1/2" 66' 10 1/4"
3.6 Mhz.130 Ft. 65 Ft.
3.7 Mhz.126' 5 3/4" 63' 3"
3.8 Mhz.123' 2" 61' 7"
3.9 Mhz.120 Ft. 60 Ft.
4 Mhz.117 Ft. 58' 6"
60 Meters
5.4 Mhz.86' 8" 43' 4"
40 Meters
7 Mhz.66' 10 1/4" 33' 6"
7.1 Mhz.65' 11" 32' 11 1/2"
7.2 Mhz.65 Ft. 32' 6"
7.3 Mhz.64' 1 1/2" 32' 3/4"
30 Meters
10.1 Mhz.46' 4" 23' 2"
10.15 Mhz.46' 1 1/4" 23' 9/16"
20 Meters
14 Mhz.33' 5 1/8" 16' 8 1/2"
14.1 Mhz.33' 2 1/4" 16' 7 1/8"
14.2 Mhz.32' 11 1/2" 16' 5 3/4"
14.3 Mhz.32' 8 3/4" 16' 4 3/8"
17 Meters
18.068 Mhz.25' 10 3/4" 12' 11 1/2"
18.130 Mhz.25' 9 3/4" 12' 10 15/16"
15 Meters
21 Mhz.22' 3 1/2" 11' 1 3/4"
21.1 Mhz.22' 1 1/8" 11' 1"
21.2 Mhz.22' 1" 11' 1/2"
21.3 Mhz.21' 11 1/2" 10' 11 3/4"
12 Meters
24.890 Mhz.18' 9 9/16" 9' 4 3/4"
24.950 Mhz.18' 9" 9' 4 1/2"
10 Meters
28 Mhz.16' 8 1/2" 8' 4 1/4"
28.5 Mhz.16' 5" 8' 2 1/2"
29 Mhz.16' 1 3/4" 8' 15/16"
29.5 Mhz.15' 10 3/8" 7' 11 1/16"