radio spectrum

noun
the portion of the electromagnetic spectrum that includes radio waves.

Origin:
1925–30

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Collins
World English Dictionary
radio spectrum
 
n
the range of electromagnetic frequencies used in radio transmission, lying between 10 kilohertz and 300 000 megahertz

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Historically, engineers have designed these chips to work within only a small
  range of frequencies in the radio spectrum.
Radio communications use radio waves at different frequencies, grouped within
  bands, that make up the radio spectrum.
As a basic plan for usage, the radio spectrum is allocated to various radio
  services in blocks of frequencies.
The genius of the cellular network is that it allowed much more efficient use
  of scarce radio spectrum.
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