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