The driven element and reflector are folded toward each other. Coupling between the tips affects impedance and improves the front-to-back ratio.
Antennas · F1SYH
Moxon rectangle
The Moxon is a compact two-element directional antenna with folded ends. It provides good front-to-back performance in less space than a conventional two-element Yagi.
HF
VHF
Directive compacte
Operating principle
Main characteristics
Typical gain
≈ 5 à 6 dBi
Impedance
Proche de 50 Ω selon modèle
Polarization
Selon orientation
Difficulty
Intermédiaire
Dimensions and design
All five principal dimensions must be calculated together. A simple half-wave approximation does not produce an optimized Moxon.
Construction and tuning
Step 1
Calculate dimensions for the actual conductor diameter.
Step 2
Build a rigid insulated frame.
Step 3
Respect tip spacing accurately.
Step 4
Install a current balun.
Step 5
Check front-to-back performance after tuning.
Advantages
- Compact dimensions.
- Good front-to-back ratio.
- Often close to 50 Ω.
- Suitable for wire construction.
Limitations
- Dimensions are interdependent.
- Sensitive to spacing errors.
- Less gain than a longer Yagi.
- Requires a supporting frame.
History and origin
The antenna is named after British radio amateur Les Moxon, G6XN, who extensively described and popularized this compact geometry.
Safety
The frame must withstand wind and preserve element spacing.