Here is a file from holl_ands for a channel 3 to 5 Log-Yagi that has two active elements and a parasitic reflector and directors. Note that the gain curve is fairly flat across the design bandwidth, as opposed to a Yagi that has a gain curve that rises from the low end to the high end.
http://imageevent.com/holl_ands/logy...0elch35logyagi
This is the Antennacraft Y-10-2-6 Log-Yagi. The design is deficient for channel 2.
http://imageevent.com/holl_ands/logyagi/y1026