beigledog: then I would suggest well spacing some hemlocks. Yes, they can get big, but they take well to pruning. It will be easy for you to get some 6-7 footers. Be sure to guy them. After about two months, take the leaders out. After taking the leaders out again years later they will pretty much assume a bush habit.
Please do not plant them in a straight row like soldiers. Stagger them and you can plant smaller plants in front of them. With the right choice of plants, you will create a bird haven.
"When in doubt, empty the clip."