WordNet (r) 3.0 (2006):

radio wave
    n 1: an electromagnetic wave with a wavelength between 0.5 cm to
         30,000 m [syn: radio wave, radio emission, radio
         radiation]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "radio wave":
   amplitude, antinode, carrier, carrier wave, crest, de Broglie wave,
   diffraction, electric wave, electromagnetic radiation,
   electromagnetic wave, frequency, frequency band,
   frequency spectrum, ground wave, guided wave, hertzian wave,
   high-frequency wave, in phase, interference, light, long wave,
   longitudinal wave, low-frequency wave, mechanical wave, microwave,
   node, out of phase, period, periodic wave, ray, reinforcement,
   resonance, resonance frequency, seismic wave, shock wave,
   shortwave, sky wave, sound wave, surface wave, tidal wave,
   transverse wave, trough, wave, wave equation, wave motion,
   wave number, wavelength