Basically you can have a "phased array" of N antennas (2 counts as an array, but you can think of a line of say N=8 antennas) that delay their broadcasts relative to each other in such a way that the N signals interfere constructively along some directions and destructively along other directions. This is because, from far away,
You don't need to point the antenna at anything; you can use multiple antennas that steer the beam ("beamforming") in a desired direction. Link:
http://en.wikipedia.org/wiki/Smart_antenna
Basically you can have a "phased array" of N antennas (2 counts as an array, but you can think of a line of say N=8 antennas) that delay their broadcasts relative to each other in such a way that the N signals interfere constructively along some directions and destructively along other directions. This is because, from far away,