Assertion: antenna's direction | /r/HasProperty | changing
Facets:
value: constantly
type: DEGREE
Source sentences:
text: Vertical whip antennas are widely used for nondirectional radio communication on the surface of the Earth, where the direction to the transmitter (or the receiver) is unknown or constantly changing, for example in portable FM radio receivers, walkie-talkies, and two-way radios in vehicles.