EFHW antenna designer

Design an End-Fed Half-Wave (EFHW) antenna, in either an inverted-L or inverted-Vee form, using a single main support. This type of antenna is designed for one principal amateur HF band, usually 80 meters or 40 meters, but typically displays VSWR minima on several higher bands, and can therefore be a good multi-band antenna. Being an end-fed (high voltage feed-point) antenna, it is most often matched using a 49:1 unun.  Read more...

Set antenna color:    

Principal band
Band:
Frequency: kHz    ?
Antenna length:
Antenna configuration
Configure as:
Length units
Units:
Antenna wire
Diameter: mm
Support pole
Height: m (At support point)
First antenna section
Length: m
Angle: Angle from vertical: °
Second antenna section
Length: m
Angle: 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:

Antenna performance

Here you can generate plots of propagation patterns, VSWR chart, antenna currents and Smith charts 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 your antenna will perform in the field.

Choose ground type of
land in the vicinity
of the antenna:
   Conductivity: S/m    Dielectric const.: F/m
View propagation plots:
Set azimuth angle for elevation plot:  °    ?
Propagation patterns for: ?
 

View VSWR chart: Check on:   From:To:
Display impedance curves: Using unun   
Impedance curves scales:   
View currents diagram:
View Smith chart:
Antenna gains
at 0° elevation:
Antenna impedance:
Frequency range: