Beverage Antenna Calculator
Calculate wavelength, recommended Beverage antenna lengths, height, termination resistance, and DX reception performance.
3
Inputs
Live
Math
3
Related
Enter parameters and click Calculate to view results
Formula & Theory
λ = 300 / f (MHz), Length = λ × Installation Factor × Ground CorrectionThis formula is used to calculate antenna parameters for beverage antenna calculator.
Overview
The Beverage Antenna Calculator determines physical length, height requirements, matching transformer ratios, and termination resistance for Beverage wave antennas. Highly favored by ham radio operators for low-band DX reception (160m, 80m, and 40m), this tool optimizes directional receiving performance on HF and MF bands.
Input Guide
Enter Frequency, Installation Type (λ), Ground Correction Factor exactly in the units shown by this beverage antenna. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- Frequency — use MHz.
- Installation Type (λ) — use λ.
- Ground Correction Factor.
Output Guide
The results describe the calculated beverage antenna values for the inputs you entered. Check each value against the available space, selected components, feed system, and operating conditions before making a final design decision.
How This Calculator Works
The Beverage Antenna uses λ = 300 / f (MHz), Length = λ × Installation Factor × Ground Correction. Supply Frequency (MHz), Installation Type (λ) (λ), Ground Correction Factor in the displayed units, then use the calculated values as the first engineering target for this specific antenna types design or analysis.
Design Notes
The Beverage antenna is a long-wire, non-resonant travelling wave antenna suspended low to the ground ($2\text{ to }3\text{ meters}$). Radio waves striking the wire induce RF currents that travel along its length toward the terminated far end. Terminating the far end with a $470\text{ to }600\;\Omega$ non-inductive resistor to ground absorbs reverse signals, producing a sharp, highly directional end-fire radiation pattern pointing toward the receiver end.
Build and Tuning Notes
Ensure the far-end termination ground rod has low RF resistance to preserve high Front-to-Back (F/B) rejection ratio. Use a $9:1$ or $12:1$ matching transformer (Unun) at the feedpoint to match the high characteristic impedance ($450\text{--}600\;\Omega$) down to standard $50\;\Omega$ coaxial cable. Keep wire heights between $2\text{ and }3\text{ meters}$—elevating the wire too high increases local noise pick-up and degrades directional sensitivity.
Frequently Asked Questions
Why is a Beverage antenna strictly used for receiving?
Because a Beverage antenna is installed very close to lossy ground, its radiation efficiency is extremely low ($<1\%$), making it unsuitable for transmitting. However, its outstanding directional pattern and low noise characteristics make it an exceptional low-band receiving antenna.
What is the purpose of the termination resistor in a Beverage antenna?
The non-inductive termination resistor (typically $470\text{ to }600\;\Omega$) absorbs energy arriving from the rear direction. Without this termination, rear signals reflect back down the wire, converting the directional end-fire antenna into a bidirectional antenna.
How long should a Beverage antenna be for optimal DX reception?
For superior front-to-back ratio and narrow beamwidth on 160m or 80m, a Beverage wire length of $1\lambda$ to $2\lambda$ ($160\text{ to }300\text{ meters}$) is recommended. Longer wires (up to $4\lambda$) provide sharper directivity but require very large land areas.
Why is wire height above ground important for Beverage antennas?
Maintaining a wire height between $2\text{ and }3\text{ meters}$ ($6\text{ to }10\text{ feet}$) allows the wave to tilt effectively toward the wire due to ground loss without picking up excess vertical electrostatic man-made noise.
Alex Warren
B.Sc. in Electrical & Electronic Engineering (EEE)
Alex specialises in antenna design and wave propagation. His expertise helps ensure these calculators present practical RF concepts, useful design estimates, and clear engineering guidance for students, HAM operators, and wireless professionals.