Height in wavelengths
The same physical wire sits progressively higher in wavelengths as frequency rises. That is why the higher bands develop additional, lower-angle lobes.
Amateur radio tool
Explore how the estimated broadside elevation pattern of an Alpha Delta DX-EE changes across 40, 20, 15, and 10 meters as its effective height changes over a sloped site.
Interactive model
Reading the plot
The same physical wire sits progressively higher in wavelengths as frequency rises. That is why the higher bands develop additional, lower-angle lobes.
Lower elevation angles are generally more useful for long-distance paths, while high-angle radiation can favor shorter regional paths.
This is an idealized image-theory model. Real soil, wire geometry, loading coils, nearby objects, and the actual terrain profile will change the measured pattern.