The modulation, AM vs FM isn't necessarily the big determine factor on distance. AM can general travel farther on less power, but its more about the frequency c

The modulation, AM vs FM isn't necessarily the big determine factor on distance. AM can general travel farther on less power, but its more about the frequency choice. FM radio stations usually operate in the VHF/UHF band, which regardless of the modulation technique, it much more likely to be line of site. AM radio stations tend to operate on HF. HF frequencies have a higher change to do bounces. Its more about characteristics of the frequency being used in this case. Under the right conditions, the 6m band, even with FM, can experience "sporadic E" and you can talk quiet far on it.