Hi Rick,
We usually attach the streamer to the aft section, just under the tail. That way when you have an opponent's ribbon hanging off a wing tip, the drag from yours will still help to stabilize the yaw effect. I don't know how great the effect is, but it can't really hurt...
We use a strong but light weight string and tape similar to the following link. It seems to hold up rather well, even in repeated use.
http://www.forestry-suppliers.com/pr...ge.asp?ID=1136
Later,
Kelly