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Beamwidth is defined at the "half-power" points, that is, -3 dB from the peak.
As an example, the ClearStream 1 & 2 antennas from our lineup have a nearly uniform beamwidth of 70°; 35° on either side of boresight where the gain is down 3 dB from the peak. Our 91XG, OTOH, has a beamwidth of only 24° at channel 51.
Last edited by ADTech; 12-Jul-2011 at 6:28 PM.
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