Stacking Yagis by G4CQM...

Conventional Yagi Four-Stack WAX8 seen in AOP...

Conventional Yagi Four-Stack WAX8 seen in AOP

K6STI's Antenna Optimizer Professional (AOP) software makes easy work of yagi stacking when using Symbolic Dimensions. See WAX8 example, opens in new window... 4WX8.ANT.

With the Free Space Symmetric command only two sets of symbolic build representations are required for four yagis, one pair in mirror. Vertical and Horizontal stacking distances are easily changed making alterations and comparison very easy!

Meanwhile 4nec2 does not have the Free Space Symmetric option so some extra coding is required. However, Symbolic Dimensions can be used, so yet again altering spacing is very easy. See WAX8 example, opens in new window...

Several designers choose to use numerical file format where errors are difficult to spot and manipulation of design parameters is awkward and time consuming. Symbolic Dimensions make life much easier and more accurate requiring only one numeric value each to describe spacing, length and diameter!

All of my designs use DL6WU stacking distances throughout, however it is worth experimenting to finally obtain the lowest temperature...

I have observed that the -3dB beam width data produced by 4nec2 is not as accurate as K6STI's AOP, resulting in less than optimal stacking distances. So, to obtain the lowest temperatures I use K6STI's AOP...

Use this DL6WU based stacking calculator as a guide only for your yagis stacking distances, simply enter the -3dB Beam Width (Degrees) information found on each yagi design page...

Enter Freq (MHz):

Enter -3dB Beam Width (Degrees):




Resultant Stacking Distances:

E-Plane (Metres) =

H-Plane (Metres) =

E-Plane (Feet) =

H-Plane (Feet) =

1994 - 2014 (20 Years)

PowAbeam Antennas