I used this web page to to get my dimensions when I made mine.
http://www.k7mem.150m.com/Electronic.../yagi_vhf.html
You can design lower gain yagi's that work fine with this site also. I have not tried transmitting with one of them yet. I'm curious too about what it would take to get it to match up. Mine is feed with 50ohm 9913 and the pigtail is 50ohm RG8X. One photo shows how I attached the pigtail directly to the driven elements. If some sort of matching device was used I suppose it would attach to the drivin elements and then to the feed line. Sound right? It receives very well and much better now that its been weather sealed and put up on the roof.