Yagi Antenna Calculator

Professional Yagi antenna dimension calculator supporting 3–20 element antenna designs, offering multiple design methods such as DL6WU, suitable for VHF/UHF amateur radio applications

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Tool Usage

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Set frequency and element count, choose correction parameters, then calculate and export results.

Suitable for VHF/UHF, WiFi bands, and common amateur radio Yagi antenna designs. Results are for size estimates and build reference. Before building, fine-tune with an antenna analyzer or NEC simulation.

DL6WU / NBS / OWA 3-30 elements Pattern / VSWR CSV / NEC / Report Settings can be saved

Current design Default 144MHz 7-element design loaded

Center frequency144 MHz2-meter amateur band

Wavelength2.082 mEstimated using vacuum light speed

Element count7DL6WU method

Estimated boom2.50 mUpdates after calculation

Tip: Confirm the operating frequency and material parameters before calculating.

Basic settings

Enter the center frequency and select the element count first. Click presets for common bands. Unit changes are converted to MHz automatically.

Operating frequencySupports kHz, MHz, and GHz input

Frequency value

Frequency unit

VSWR target

Array count

Antenna setupMore elements, longer boom, higher directivity

Element setup

Element count Enter 3-30 elements

Design method

Feed method

DL6WU suits long Yagis with 6+ elements, using increasing spacing for balanced gain and F/B ratio.

Correction parameters

Set element, boom, and environment parameters. Defaults suit common aluminum tube builds and can be saved as the startup defaults.

Materials & unitsFor length correction, weight, and wind load estimates

Element diameter (mm)

Boom diameter (mm)

Boom wall thickness (mm)

Material Type

Boom Diameter Correction Insulated Element Mounting Show Wavelength Ratio Auto-save History

Environment & DisplayAdjust by installation environment

Result Units

Display Precision

Height Above Ground (m)

Operating Temperature (°C)

Additional Loss (dB)

Design Wind Speed (m/s)

Installation Margin (mm)

Feed Loss (dB)

Calculate & export

After calculation, an element size table, structure diagram, radiation pattern, VSWR curve, bill of materials, and export files will be generated.

Export & SharePlease complete a calculation first

HistoryLimit: 20 items

No calculation history yet. Completed calculations will appear here and can be loaded with one click.

Results

A design summary will appear after calculation.

Net Gain-

Front-to-Back Ratio-

Boom Length-

Estimated Weight-

Antenna Structure Elements are vertical; boom points from reflector to directors

Radiation Pattern Normalized Estimate

Element Size Table Unit: mm

#	Element	Type	Length	Position	Diameter	Wavelength Ratio	Notes

VSWR Frequency Response Estimated by design method

Electrical Performance

Mechanical Specs

Feed and Array Tips

Bill of Materials Adjust actual purchases for mounting hardware and extra allowance

Item	Specs	Qty	Unit length	Notes

Instructions

Software Usage Instructions

Set the operating frequency: Enter the center frequency and select kHz, MHz, or GHz as the unit, or click preset bands such as 50MHz, 144MHz, 430MHz, 1296MHz, 2.4GHz, and 5.8GHz.
Select the antenna configuration: Choose 3 elements, 5 elements, 7 elements, 10 elements, 13 elements, or a custom quantity of 3–30 elements, and select the DL6WU, NBS, or OWA design method.
Configure the feed method: Select a standard dipole, folded dipole, or Gamma match. The tool will also provide impedance, matching method, and tuning suggestions.
Set material and correction parameters: Enter the element diameter, boom diameter, boom wall thickness, and material type, and enable boom correction, insulated mounting, temperature correction, and wind load estimation according to the installation method.
View calculation results: After clicking “Calculate Antenna Dimensions,” you can view the element dimension table, structural diagram, radiation pattern, VSWR frequency response, electrical performance, mechanical specifications, and bill of materials.
Save and export: You can save the current settings, load historical designs, and export CSV, NEC, JSON, structural diagrams, radiation patterns, or save reports by printing.

FAQ

A: DL6WU is suitable for long-boom Yagi designs and is commonly used for long VHF/UHF antennas; NBS focuses on balanced dimensions and general-purpose parameters; OWA focuses on wider matching bandwidth and a flatter VSWR curve.

A: A metal boom changes the effective electrical length of the elements, especially when the elements pass directly through the boom. When boom correction is enabled, the tool adjusts the length based on the boom diameter, element diameter, and mounting method.

A: The calculation results are suitable as a starting point for construction. In actual building, it is recommended to leave a small tuning margin and use an antenna analyzer to measure the center frequency, impedance, and VSWR, then fine-tune the driven element or matching structure.

A: NEC files can be imported into antenna simulation software such as 4nec2, EZNEC, and MMANA-GAL for further analysis of radiation patterns, gain, input impedance, and frequency response.

A: Gamma matching makes it easy to tune for 50Ω coaxial feed; a standard dipole has a simple structure but usually requires a matching network; a folded dipole has higher impedance and is often used with a 4:1 balun, making it suitable for designs that need a wider matching range.

A: Wind load is estimated based on the set wind speed and windward area, while the safety factor is used to assess the strength margin of the boom. If the safety factor is low, it is recommended to increase the boom diameter, shorten the boom, lower the installation height, or add supports.