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In the Narrow directivity mode, the three full-ranges are used from 200 Hz to 4,000 Hz, so driver output favors a listener sitting in front of the speakers, without the interference of side and rear wall reflections.—Robert Ross, Robb Report, 4 May 2021 Brand New Test Frontier The mmWave frequencies demand more sophisticated RF parametric measurements for signal gain, directivity, beamwidth and antenna efficiency.—IEEE Spectrum, 3 Dec. 2018 His idea was to pick up that signal with a portable radio receiver using the receiver’s loopstick antenna for directivity.—Andrew Freeman, Outside Online, 21 May 2012
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