Antenna Design Portal

First-principles antenna calculators for hams, RF engineers, students, and makers. Every result shows its correction factor, its method, and an honest accuracy note — no magic numbers. All math runs in your browser and works offline.

00 Quick start · set your Center Frequency

Most-used frequency

MHz

Second (optional)

MHz

Center frequency

MHzDERIVED

Flows into every Designer and Tool via the masthead field and shareable links.

01 Engineering Tools

Wavelength exact Velocity Factor exact Resonant Frequency exact Balun Ratio exact SWR exact Feed Line Loss published-design Bandwidth closed-form Loading Coil closed-form

02 Antenna Models

Tier 1 · closed-form staples

Half-Wave Dipole closed-form· loadable Inverted-V Dipole closed-form Folded Dipole closed-form Quarter-Wave Vertical / Ground-Plane closed-form· loadable Half-Wave Vertical closed-form 5/8-Wave Vertical closed-form End-Fed Half-Wave (EFHW) closed-form Full-Wave Loop (Quad) closed-form Delta Loop closed-form Random / Long Wire closed-form

Tier 2 · published-design

Yagi-Uda published-design Moxon Rectangle published-design J-Pole / Slim Jim published-design

Tier 3 · complex / niche

Magnetic Loop (Small Transmitting Loop) closed-form Discone published-design G5RV published-design Off-Center-Fed Dipole (Windom) published-design