A yagi is the same thing except the rods are evenly spaced and each is as long as the other. This is a high gain, narrow band antenna. The more segments (rods) a yagi has the more directional and higher gain it is.
Both types of antenna's usually have a reflector at the back, which is another rod at an irregular spacing to the others.
I use an antenna in the Yagi family, 25-30 miles from the transmitters in Boston. One of these: http://www.antennasdirect.com/42xg___extreme_gain_42_element_y.htm
From what I understand, the corner reflector flattens out the frequency response somewhat over a normal Yagi. On this particular antenna, the stacked arrangement of the rods flattens the beam (reception area), which is no great loss for terrestrial signals; this means it can use a relatively few segments and still get good gain.
-Doug
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