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    An antenna with gain creates no energy

    dBi, dBd and radiation pattern, simulated in NEC2 at 1090 MHz: a dipole at 2.14 dBi, a Yagi at 7.37 dBi, a collinear at 5.08 dBi that flattens its lobe, and the same radiated power for all four. Worked example: an ADS-B receiver on a roof, whip or collinear?

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