Yep.

Didn't have permission to hunt the adjacent property, and the bird was roosted on the top of their hill. Went into the hollow, and after getting his attention, he came in silent. Took him about 2 hrs, but he got there

It's generally regarded more difficult to call them downhill, just because ole Tommy expects to see his hen as he walks down the hill. Walking up the hill, he expects to see her just as he reaches the summit.

I've called them downhill, over creeks, over swamps, across roads, over stone walls, through fences...well, you get the idea. Find a bird that's eager enough, and they'll walk through fire & brimstone to get to that lady [8D]