Assertion: antenna's height | /r/HasProperty | declines
Facets:
value: up to about 3/8 wavelength
type: TEMPORAL
value: only slightly
type: DEGREE
value: for heights
type: PURPOSE
Source sentences:
text: Optimum height is about 1/4 wavelength, and high angle radiation declines only slightly for heights up to about 3/8 wavelength.