I got a similar situation, 600' of road frontage, a very slight incline up to our living room, bedroom, dining room windows, 400' away. We also have poachers shooting deer in our front yard (8 acres), dragging them to their pickups and speeding off in the middle of the night.
We were looking into putting up cattle panels (expensive) with electric on top and sides (S.S. wire is free for me), and then planting Nanking Cherry, Native Plum & Russian Olive as a visual block. I'm an idiot on this stuff, I just put it in the ground and/or cut it down, kinda guy - and I don't want 600' of hedge to trim, EVER. My experience with Russian olives is they grow FAST. The rest is to provide some berries for the birds (our ducks & turkeys). We were thinking of transplanting thorned blackberries.
I don't like to rebuild fences, nor do I like the neighbor's dogs harassing our flocks, so I'm leaning towards treated posts and 16' cattle panels with a metal post in the middle of each span. In addition to the birds, we'll be having a few cows and possibly some goats. Any fence can be easily installed on the road frontage, it's open and flat.
Half way up the field, where we were going to put a temporary electric fence, we were thinking of planting populars, again because they grow fast.
Any suggestions?
Bill