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Free Antenna Length Calculator | RF Wavelength Calculator for Ham Radio & WiFi

/antenna-size
Free online antenna length calculator for optimal RF performance. Calculate antenna dimensions for any frequency including dipole, quarter-wave, half-wave, and full-wave antennas. Perfect for ham radio operators, WiFi installations, amateur radio, CB radio, and RF engineers. Get precise antenna measurements in meters, feet, and inches for 2.4GHz, 5GHz, HF, VHF, UHF bands and more.
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Parameters

frequency undefined
Frequency in MHz (e.g., 146.52 for 2m ham band, 2400 for WiFi)
unit undefined
Output unit: meters (default), feet, or inches

Examples

curl 
curl 'https://tcpdata.com/antenna-size?frequency=146.52'
curl 
curl 'https://tcpdata.com/antenna-size?frequency=2400&unit=inches'
curl 
curl 'https://tcpdata.com/antenna-size?frequency=27.185'

Notes

Calculations assume speed of light in vacuum (299,792,458 m/s)

Actual antenna dimensions may need velocity factor adjustment (typically 0.95-0.97 for wire)

Common bands: 2.4 GHz (WiFi), 5 GHz (WiFi), 146 MHz (2m ham), 446 MHz (70cm ham), 27 MHz (CB)

Full wavelength (λ): Complete wave cycle

Half wavelength (λ/2): Common for dipole antennas

Quarter wavelength (λ/4): Common for monopole/vertical antennas

For best results, add 2-5% extra length and trim to tune