9M2PJU Basic Antenna Calculator

Operating Frequency (MHz):

Antenna Type:

Vertical Antenna

Antenna Height: -

Ground Plane Length: -

Impedance: -

Gain: -

Balun Type: -

Balun Ratio: -

Dipole Antenna

Total Length: -

Each Side: -

Impedance: -

Gain: -

Balun Type: -

Balun Ratio: -

Yagi Antenna

Driven Element: -

Reflector: -

Director: -

Boom Length: -

Gain: -

Balun Type: -

Balun Ratio: -

Quad Antenna

Loop Perimeter: -

Side Length: -

Impedance: -

Gain: -

Balun Type: -

Balun Ratio: -

📊 Calculations Include:

Velocity factor compensation
Standard impedance values
Typical gain figures
Practical dimensions
Balun type & ratio

⚠️ Notes:

Dimensions are theoretical
Fine-tuning may be required
Consider local conditions
Check local regulations

🔌 Balun Information:

Current Balun: For balanced loads (dipole, vertical, yagi)
Voltage Balun: For high impedance loads (quad, loop)
1:1 Ratio: No impedance transformation
4:1 Ratio: Transforms 300Ω to 75Ω