Antenna Length
3.21 ft
Meters
0.977 m
λ
2.053 m
Antenna Length
3.21 ft
0.977 m
Inputs
Result
L = 468/146 = 3.21 ft. Each arm = 3.21/2 = 1.60 ft. λ = 299.792/146 = 2.053m.
Inputs
Result
L = 234/2437 = 0.096 ft = 29.2mm.
Half-wave dipole: L(ft) = 468/f(MHz). For 146MHz (2m ham): L = 468/146 = 3.21 ft (0.98m). Each arm is half that length. The 468 factor accounts for end effects.
| Band | Frequency | Dipole Length | Each Arm |
|---|---|---|---|
| FM Radio | 100 MHz | 4.68 ft | 2.34 ft |
| 2m Ham | 146 MHz | 3.21 ft | 1.60 ft |
| 70cm Ham | 440 MHz | 1.06 ft | 0.53 ft |
| WiFi 2.4G | 2437 MHz | 0.19 ft | 0.10 ft |
L(ft) = 234/f(MHz). A quarter-wave is half a dipole, used with a ground plane. For 146MHz: 234/146 = 1.60 ft. Requires ground radials of the same length.
A Yagi has a driven element (dipole), one reflector (5% longer), and one or more directors (9% shorter). It creates a directional beam with gain proportional to the number of elements.
Slightly. The 468/f formula assumes thin wire in free space. Thicker elements lower frequency slightly (use 460-466). Insulation and nearby objects also affect tuning.
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Last Updated: Mar 20, 2026
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