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This is something we must all have observed, but I don't know of any definitive study. In the absence of hard data I can think of three potentially relevant effects: Dielectrics, like the human body, deform electromagnetic fields in their vicinity The wavelength of FM radio is around 3m and therefore comparable to the size of a typical human. This means ...

1

In general a larger antenna gives a larger signal at the input of the receiver. Since the receiver is not noise-free the signal to noise ratio is increased, resulting in better reception. The antenna itself is not noise-free (unless strongly cooled down) but this is usually of minor importance. Actually amplitude modulation is not so much used, rather a ...

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