Antenna Model · Designer · closed-form
Half-Wave Vertical
length = factor × λ × k · λ = 41.93 m @ 7.150 MHz
FIG.1 · HALF-WAVE VERTICAL
Radiator
19.916m
Accuracy note
±~3%, trim to resonance; feed impedance is high regardless of ground system.
±~3%, trim to resonance; feed impedance is high regardless of ground system.
Method closed-form Cite ARRL Antenna Book Feed ~2000–4000 Ω, high and reactive at the base — needs a matching network, not a ground plane.
- No ground plane or radial field required — the feedpoint carries little current.
- Fed at a high-impedance point; needs a base matching network (L-network or unun).