Dipole and Inverted Vee Antenna Calculator

Sufficiently accurate for wire antennas up to 30 Mhz.

Dipole Antenna   Inv V-Antenna

Enter the Center Frequency for Antenna and if Inverted Antenna the Degree of slop.

Frequency in Mhz.   
Select V-Angle.

Dipole's length
Each leg    

Total Vee length 
Each Vee leg   
Min vert. height   
Min horiz. spread  

Assuming level ground, the minimum height of vee will be  (length of leg * sin(angle from horizontal) plus the height of endpoints of vee above ground. The horizontal spread of Vee will be the distance from endpoint to endpoint, plus the tie off points..

NOTE: Remember that location, height, obstructions, wire type, wire coating, etc will effect the calculated lengths.  Always cut your wire a little longer and then trim for your installation.

The basic formula for determining the wire length of a center fed, 1/2 wave wire dipole or inverted Vee antenna (30 mhz or less) is 468/freq(mhz).

The inverted Vee antenna will be shorter by 2 - 5%  depending on the angle from horizontal.

Dipoles and inverted vee antennas have a feed point of about 75 ohm's in free space, and can be fed with 52 to 72 ohm coax with or without a 1:1 balum.


Vertical Antenna Calculator

This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. Enter the desired frequency and select the wavelength. Click on Calculate and the optimum length for that combination will be displayed in feet, inches and fractions of inches, and in meters. To optimize the antenna for a frequency RANGE, do the calculations twice, once for the low end of the range and once for the high end; then average the two and plan to adjust the VSWR on both ends of the range as needed.


 Required Data Entry
 Desired Frequency Mhz
 Select Antenna Wavelength
   
Calculated Results
 Calculated Vertical Length  

Cliff Wagoner, W3ZL
Carolina DX Association
218 Ohenry Ave.
Davidson, NC 28036
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