Assertion: radio wave's wavelength | /r/ObjectUse | used on ground-based systems
Facets:
value: generally
type: MANNER
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.