Assertion: aircraft detection radar | /r/CapableOf | employ antenna
Facets:
value: generally
type: DEGREE
Source sentences:
text: An aircraft-surveillance radar generally employs an antenna that radiates a “fan” beam, one that is narrow in azimuth (about 1 or 2 degrees) and broad in elevation (elevation beamwidths of from 20 to 40 degrees or more).