Free & Open Source

Design Antennas with Confidence

Professional-grade calculators for magnetic loop and dipole antennas. Proven formulas, real-time results, completely free.

Tell us about your setup and we'll recommend the right calculator

Band

Space

Power

Compact & Efficient

Magnetic Loop Calculator

Design small transmitting loops for HF bands. Perfect for apartments, balconies, or restricted spaces. Calculate efficiency, Q-factor, tuning capacitance, and RF safety distances.

Efficiency AnalysisRF SafetyCapacitor Sizing

Open Calculator

Magnetic loop antenna illustration showing copper tubing loop with variable capacitor at top and coupling loop with coax feedline at bottom

Half-wave dipole antenna illustration showing copper wire elements, center insulator with coax feedline, and end insulators with support ropes

Simple & Effective

Dipole Calculator

Calculate wire lengths for horizontal or inverted-V dipoles. Includes end-effect corrections, wire material adjustments, and height considerations for optimal performance.

Length CalculationInverted-V SupportMulti-band

Open Calculator

Learn as You Build

Understand the theory behind your designs. Our guides explain the physics, trade-offs, and practical tips for better antennas.

Loop Efficiency & Q-Factor Dipole Tuning Guide RF Safety Guidelines

View All Guides

Ready to design your antenna?

No signup required. Just pick a calculator and start designing.

Get Started