Assertion: antenna's wavelength | /r/HasProperty | long
Facets:
value: at these frequencies
type: OTHER
value: tens to hundreds of meters
type: OTHER
value: hundreds of metres
type: OTHER
Source sentences:
text: In the United States, amplitude modulation (AM) radio broadcasting, for instance, is done at frequencies between 535 and 1,605 kilohertz (kHz); at these frequencies, a wavelength is hundreds of metres or yards long, and the size of the antenna is therefore not critical.
text: At these frequencies a typical wavelength is about 3 metres (10 feet) long, and the antenna must be adjusted more precisely to the electromagnetic wave, both in transmitting and in receiving.
text: However, small loops become practical at lower frequencies where wavelengths are tens to hundreds of meters long, or greater, and full-size loops (the most efficient) and half-wave straight-wire antennas (next-most efficient) become infeasibly large.