Assertion: parabolic antenna | /r/HasProperty | built in his backyard
Facets:
value: by pioneering radio astronomer grote reber
type: OTHER
Source sentences:
text: The first large parabolic antenna, a 9 m dish, was built in 1937 by pioneering radio astronomer Grote Reber in his backyard, and the sky survey he did with it was one of the events that founded the field of radio astronomy.