ON AIR

Yagi Antenna Calculator

Experimental online Yagi antenna calculator. Calculate element lengths, boom spacing, and radiation patterns for VHF/UHF with built-in NEC-2 simulation and SWR optimizer.

Dimensions use DL6WU/DK7ZB empirical formulas and are verified by NEC-2 simulation. Treat results as a starting point ā€” tune on the antenna.

Building for MeshCore, Meshtastic or LoRaWAN? A Yagi can push you over the EU868 limit: check your ERP and duty cycle.

1. Antenna Parameters

Frequency & Band
Design Objective
Size & Elements
Set by:
≈ ā€” boom
Construction & feed Boom, mounting, material, impedance

2. Simulation & Optimization

NEC-2
Simulation settings Ground, VSWR sweep
Auto-Optimizer
šŸ“ Fine Wire Coordinates & .NEC File Click to expand
Name Type Pos(m) Len(m) Ƙ(mm)
Forward Gain (dBi)
ā€”
ā€”
Impedance & VSWR
ā€”
VSWR ā€”  (Target 50 Ī©)
Front-to-Back (F/B)
ā€”
Main beam vs rear
Beamwidth (Az / El)
ā€”
HPBW
Boom Dimension
ā€”
+0.0 mm correction
Bandwidth
ā€”
VSWR < 1.5 window
Feed System & Matching
Direct 50 Ī© Feed
Antenna Blueprint
Dimensions & Spacing

Element Dimensions

Element Position from Reflector Step from Prev Total Tip-to-Tip Half Length (Center to Tip)