WAntenna diversity
WAtmospheric duct
WCassegrain reflector
WClutter (radar)
WCurtain array
WDirectional antenna
WRadio beacon
WElectromagnetic radio frequency convergence
WForward scatter
WFrequency-hopping spread spectrum
WFresnel zone
WSurface wave
WGroup velocity
WInteractive Scenario Builder
WInternational Reference Ionosphere
WInversion (meteorology)
WIonosphere
WIonospheric absorption
WKennelly–Heaviside layer
WLine-of-sight propagation
WMercury Systems
WMeteor burst communications
WMie scattering
WNew Horizons
WNorth Atlantic Radio System
WRadar angels
WRadio propagation
WKarl Rawer
WShortwave relay station
WSide lobe
WSkip zone
WSkywave
WSouthern Hemisphere Auroral Radar Experiment
WSpace weather
WSporadic E propagation
WSurface wave
WTelevision antenna
WTropospheric scatter
WVoyager 1
WVoyager 2
WWhite Alice Communications System