Assertion: antenna's height | /r/HasProperty | the case
Facets:
value: for all electric antennas
type: OTHER
value: usually
type: DEGREE
Source sentences:
text: In this case the height of the tower may be greater than is usually the case.
text: As is in general the case for all electric antennas, the height of the G5RV above the ground should be at least half of the longest wavelength to be used.