F1SYH design tool

Amateur radio antenna calculator

Enter a frequency, choose an antenna and immediately obtain starting dimensions for construction.

These values are starting points. Surroundings, height, conductor diameter, insulation and nearby objects affect actual resonance.

Frequency (MHz) Value between 0.1 and 3000 MHz.

Antenna type

Shortening factor 0.95 is generally suitable for insulated wire. Use 1.00 for free-space theoretical wavelength.

Calculated dimensions

Frequency —

Wavelength —

Shortening factor —

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