Antenna Model · Designer · closed-form
End-Fed Half-Wave (EFHW)
length = factor × λ × k · λ = 41.93 m @ 7.150 MHz
FIG.1 · END-FED HALF-WAVE (EFHW)
Total length
19.916m
Accuracy note
±~2%, trim to resonance at the far end.
±~2%, trim to resonance at the far end.
Method closed-form Cite ARRL Antenna Book Feed ~2500 Ω at the end (49:1 unun → 50 Ω).
- Fed at a high-voltage end point.
- A short counterpoise tames common-mode current.