This calculator provides approximate lengths and spacing for a Yagi antenna based on a given frequency and number of elements.

The model assumes:

• Reflector: ~5% longer than driven element
• Driven Element: ~½ wavelength
• Directors: ~10% shorter than driven
• Element spacing: ~0.2 × wavelength

These values provide a starting point for design and construction. For fine-tuning, use modeling tools or physical adjustments with SWR meters or analyzers.