Assertion: radio wave's frequency | /r/CapableOf | travel beyond the horizon
Facets:
value: as ground waves
type: MANNER
value: by reflecting off the ionosphere
type: MANNER
Source sentences:
text: The subsequent development of radio communication after 1896 employed lower frequencies, which could travel beyond the horizon as ground waves and by reflecting off the ionosphere as skywaves, and microwave frequencies were not further explored at this time.