sota-antennas - EFHW antenna designer

Set antenna color: Show person-height plane

Principal band
Band:
Frequency:	kHz
Antenna length:	m
Antenna configuration
Configure as:	calculated ½-wave end-fed wire random-length end-fed wire
Antenna wire
Diameter:	mm
Support pole
Height:	m (At support point)
First antenna section
Length:	m
Angle:	Vertical Angle from vertical: °
Second antenna section
Length:	m
Angle:	Horizontal Angle from horizontal: °
Counterpoise (radial)
Length:	m
Inductance load
Value:	µH
Position:	m above foot

Antenna overview

Support
height

Counter-
poise

Section #1

Section #2

Length

Angle

Length

Angle

Press the "Show antenna" button to display your antenna
configuration here in interactive 3D graphics mode

Antenna feed-point: ⬥ Inductance load: ●

Show display hints:

Antenna performance

Here you can generate plots of radiation patterns, VSWR chart, antenna currents diagram and Smith chart for your antenna over a choice of ground types. By changing the physical dimensions of the antenna, and refreshing these plots, you can learn a lot about how such antennas will perform in the field.
Please note that radiation patterns are here modelled over flat ground - when the antenna is erected on a hill-top or mountain summit, the surrounding sloping ground will generally cause angles in the elevation radiation pattern to be lowered in the direction of the slope: the steeper the slope, the lower the effective elevation take-off angle will be, and the better the chances of making long-distance contacts.

Export antenna dimensions to file

Export format:
CSV options:	Text delimiter:
CSV options:	Column separator:

EFHW antenna designer - correction factors reference

Length-correction factor used in this application - this will be applied automatically

End-effect multiplication factor - dependent on wire diameter and frequency

End effect multiplication factor

Wavelength / wire diameter ratio, λ/d:

End-effect multiplication factor :

Save antenna configuration

Give your antenna configuration a meaningful title...

Title:

Manage saved antenna configurations

Your saved antenna configurations:

Click on
an antenna
configuration
to select it

Double-click
to load a
configuration

Coordinates can be used to model the same antenna in a separate program

#	Freq. MHz	Section Length	Angle	Element coordinates
#	Freq. MHz	Section Length	Angle	x1	y1	x2	y2
1	1	1	1	1	1	1	1

Copy this CSV text and paste into your favorite spreadsheet program

You may choose an example from the list and import it into your "Favourites" list

Title	Band	Freq. kHz	Units	Wire Dia.	Supp. Ht.	Section #1		Section #2		Cp./Rad. Length
Title	Band	Freq. kHz	Units	Wire Dia.	Supp. Ht.	Length	Angle	Length	Angle	Cp./Rad. Length
Some title	40m	7000	m	1	1	1	1	1	1	1

EFHW antenna designer

Choose ground type of land in the vicinity of the antenna:	Conductivity: S/m Dielectric const.: F/m
View radiation patterns:	Azimuth Set elevation angle for azimuth plot: Auto Choose: ° Elevation Set azimuth angle for elevation plot: Auto Choose: ° 3D
Radiation patterns for:	Principal band only
	Choose band(s): 80m 60m 40m 30m 20m 17m 15m 12m 10m 6m
View VSWR chart:	VSWR Check on: Principal band Bands range From: To:
Display impedance curves:	Using unun
Impedance curves scales:	Shared Independent:
Effect of coax on VSWR:	Include coax losses Coax length: Type:
	Show coax losses as: Percentage loss dB loss
View currents diagram:	Antenna currents diagram
View Smith chart:	Smith chart
Antenna gains at 0° elevation:
Antenna impedance:
Frequency range: