In addition to line-of-sight, your AM station is transmitting more or less omnidirectionally. Significant gains (pun intended) can be had by narrowing your beam

In addition to line-of-sight, your AM station is transmitting more or less omnidirectionally. Significant gains (pun intended) can be had by narrowing your beam. Check out the Link Budget Equation: http://en.wikipedia.org/wiki/Link_budget http://en.wikipedia.org/wiki/Link_budget