Overview
Quick RF antenna length reference for common ISM, WiFi and radio frequencies.
Practical notes
- 433 MHz quarter-wave ≈ 17.3 cm.
- 868 MHz quarter-wave ≈ 8.2 cm.
- 915 MHz quarter-wave ≈ 7.8 cm.
- 2.4 GHz quarter-wave ≈ 3.1 cm.
Installation advice
Test the antenna in the final installation position and enclosure. Nearby metal, cables and PCB layout can affect tuning and range.