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Whip antennas must work against a ground plane. If it's a whip antenna built into a handheld radio, the radio body (and you) act as the ground plane. If you're building a vertical whip antenna, it's common to provide a ground plane from ARRL:


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The bispectrum, is probably most intuitively understood from its definition derived from the convolution theorem, $$B(f_1,f_2)=F(f_1)F(f_2)F^*(f_1+f_2),$$ where $F(f)$ is the Fourier transform evaluated at frequency $f$. From this, observe that bispectra are simple 2D transforms that allow the observation of relationships between frequency bins of a Fourier ...


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