Quickly calculate the correct wire length for a half-wave dipole antenna at any frequency. Enter your frequency in MHz to instantly get accurate dimensions for efficient antenna construction and low SWR.
New to antenna systems? See our Complete Guide to Ham Radio Antennas.
How It Works
This calculator determines the proper dipole length based on frequency, giving you real-world values so you can cut your antenna correctly and reduce tuning time.
Tips for Best Results
- Cut the wire slightly longer than calculated
- Install the antenna before final trimming
- Adjust gradually for lowest SWR
- Keep the antenna away from nearby metal objects
FAQ
Do I need a tuner?
A properly cut dipole usually does not require a tuner on its resonant frequency, but one can help when operating outside that range.
Why is my SWR still high?
Height, nearby objects, feedline issues, and installation setup can all affect resonance. Make small adjustments after installation.