Antenna Calculators
Quick tools for antenna design calculations
Ground Plane — 4NEC2 Generator
λ/4 vertical + N elevated radials → .NEC file with SY variables
Dipole Calculator
Total Length = 142.65 / f(MHz)
Quarter Wave Calculator
Length = 71.325 / f(MHz)
Radial Calculator
Radial Length = 71.325 / f(MHz)
End-Fed Transformer Calculator
Turns Ratio = √(impedance ratio)
SWR Calculator
SWR = (1 + √(Pr/Pf)) / (1 - √(Pr/Pf))