sota-antennas - Half-square antenna designer

Set antenna color: Show person-height plane

Principal band
Band:
Frequency:	kHz
Total length:	m (Adjusted for end-effect)
Antenna configuration
Configure as a:	current-fed full-wave single bander voltage-fed EFHW, multi-bander
Antenna wire diameter
Wire diam. :	mm
Antenna supports
Height:	m (At support point)
Antenna foot height
Foot height:	m
Vertical sections length
Length:	m
Top section length (ref.)
Length:	m
Counterpoise (radial) - not applicable to current-fed single-bander
Length:	m
Inductance load - not applicable to current-fed single-bander
Value:	µH
Position:	m above foot

Antenna overview

Antenna sections lengths

Foot height

Full height

Cp. / radial

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 of each section can be used to model this antenna in a separate program

Main antenna characteristics
Band	Frequency (kHz)	Units	Support height	Wire diam.	Antenna config.	Induct. load
Band	Frequency (kHz)	Units	Support height	Wire diam.	Antenna config.	Value	Pos.
a	b	c	d	e	Current-fed	N/A	N/A

Antenna sections
Section		Segment start			Segment end
Ident.	Length	x	y	z	x	y	z
Driver #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

Half-square 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
Check prop. patterns on:	Principal band Choose band:
View VSWR chart:	VSWR Check on: Principal band Bands range From: To:
Display impedance curves:	Using 49:1 unun Without 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: