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If you really wanted AM on your iRiver, the easiest way would be to build/buy some sort of AM tuner and plug it and an antenna into the line in. AM is a much lower frequency than FM (.6-1.4 MHz), but has much larger wavelengths, on the order of 300ft. This is why you need a longer antenna, preferably 150ft, which is why they are often coiled. Compare to FM, with a frequency range of 90ish - 110MHz and a wavelength of around 3ft, requiring an antenna around 1.5 ft long. However, the real reason the H300's can't do AM is because the radio signal is encoded on the AM waves differently than on the FM waves. For FM waves, the frequency of the carrier signal is changed according to the source signal(music, talk, etc.). For AM waves, the amplitude of the carrier signal is changed according to the source signal. So the hardware needed to decode each are different, and that's why the H#0's can't do AM. Hope that makes sense and is somewhat informative.
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