"Kari B" wrote in message
ti.fi...
After some time spend with an antenna simulator and changing yagi height
above the virtual simulated ground there seemed to be a minimum of high
angle lobes at 80..90 degr. when the antenna height reached 2 wavelength
above the virtual ground... This effect probably remain the same in each 2
wavelengths up.. ?

Just curious is the effect real, useful or detectable in real world or
used somewhere in ham world ?

br Kari B

yes, its real and useful if you can control the height of a single antenna.
the effect should be periodic more like every half wave in height.