Yagi Antenna Calculator
Professional Yagi antenna calculator for ham radio, WiFi, LTE, LoRa, and RF communication systems.
- Reflector length
- Driven element length
- Director length
- Boom length
- Estimated antenna gain
- Element spacing
Input Parameters
Results
Yagi Antenna Diagram
How Yagi Antennas Work
A Yagi antenna focuses radio energy in one direction using:
- Reflector
- Driven element
- Director elements
This creates higher gain and longer communication range compared to simple omnidirectional antennas.
Real-Life Example
A rural ham radio operator installed a 145 MHz Yagi antenna on a 10-meter tower to improve repeater access in mountainous terrain.
Before installation:
- Weak repeater signal
- Frequent fading
- Unstable communication
After installing the Yagi:
- Strong directional signal
- Reliable emergency communication
- Improved range
Tutorial — How to Build a Yagi Antenna
- Choose operating frequency
- Calculate element lengths
- Install reflector behind driven element
- Install directors in front
- Mount antenna horizontally
- Aim toward target signal source
- Tune SWR using antenna analyzer
Recommended Affiliate Products
NanoVNA Antenna Analyzer
Professional RF analyzer for tuning Yagi antennas and measuring SWR.
Check PriceCommon Problems and Solutions
Usually caused by incorrect driven element length or poor feedline connection.
Increase mounting height and point antenna accurately toward signal source.
Director spacing may be incorrect or nearby metal objects may interfere.
Frequently Asked Questions
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