Assertion: radio wave's wavelength | /r/HasProperty | low frequencies
Facets:
Source sentences:
text: RDF systems can be used with any radio source, although the size of the receiver antennas are a function of the wavelength of the signal; very long wavelengths (low frequencies) require very large antennas, and are generally used only on ground-based systems.
text: The long wavelength, low frequency
text: Since the ionized layers are often several miles thick, ionospheric reflection is more likely to occur at long wavelengths (low frequencies).