Length of a half-wave dipole
The physical length of a half-wave long dipole must respect the relation:
Length (meters) = 142 / frequency (MHz)
|
QRG |
1.8 MHz |
3.8 MHz |
7.05 MHz |
14.2 MHz |
18.1 MHz |
21.1 MHz |
24.9 MHz |
28.5 MHz |
|
L (m) |
78.9 m |
37.4 m |
20.1 m |
10.0 m |
7.8 m |
6.7 m |
5.7 m |
4.9 m |
|
L (ft) |
260′ |
123.1′ |
66.4′ |
32.9′ |
25.8′ |
22.2′ |
18.8′ |
16.4′ |
Source: http://astrosurf.com/luxorion/qsl-antenna.htm