Back
hfverticalshortenedhelicalcompact

Helical Vertical

Helically wound shortened vertical

Source: Rothammel, Vol. 1, Ch. 19.10, p. 412
Input Parameters
MHz
mm
m
Results
Antenna Height
6.00m
Full λ/4 (no shortening)
10.56m
Number of Turns
67
Wire Length
10.56m
Shortening
43.2%
Feed Impedance (approx)
15.7Ω
Diagram
50 Ω coax6.00 m6.00 m
Radiation Pattern
-3 dB-10 dB-20 dB0 dB0°90°180°270°Max: 0.0 dBi