VHF and UHF antenna calculator
Antennas from 100 MHz to 1.3 GHz: 2 m, 70 cm and 23 cm, airband, marine, PMR446, satellites and ADS-B. Pick an antenna or a tool, move the controls and watch the dimensions, SWR and patterns change. Everything runs in your browser.
DL6WU Yagi
3 to 20 elements, with element diameter and boom corrections.
Results
SWR around the frequency
- Up to 2:1: straight into the rig
- SWR 2 to 3: it works, but worth tuning
- Above 3:1: needs an external tuner
Move the mouse or your finger over the chart, or use the arrow keys, to read SWR and impedance.