HF Antenna Calculator
Set Freq =
MHz.
λ =
λ/2 =
λ/4 =
feet.
m.
|
Quarter-wave Vertical
|
● Height =
feet.
m.
|
Half-wave Dipole + Inverted-V
Resonant on odd harmonics.
|
● Flat Dipole, Length =
Len/2 =
feet.
m.
● 120° apex, Length =
Len/2 =
Rise =
Run/2 =
feet.
m.
● 90° apex, Length =
Len/2 =
Rise =
Run/2 =
feet.
m.
|
Full-wave Loop
Resonant on odd and even harmonics.
|
● Bare-wire, Length =
Sq-side =
Diam =
feet.
m.
● Insulated, Length =
Sq-side =
Diam =
feet.
m.
|
Single-Wire Beverage
Non-Resonant, for selected 3dB Beamwidths.
|
● Length =
180°
110°
80°
50°
feet.
m.
|
NVIS Loss vs Height
Referenced to 0dB at Elevation = λ/8, average soil.
|
●
0dB
-3dB
-5dB
-13dB
-25dB
feet.
m.
|
Harmonic Frequencies
|
● Odd --
x1
x3
x5
x7
x9
MHz.
|
● Even --------
x2
x4
x6
x8
MHz.
|