The higher you can get, the farther the sound will carry, and thus be heard. The ideal situation is to walk the spine of a ridge so your calling can be heard down into adjacent valleys on both sides. Another late-season strategy involves patience and persistence. Patience is one of the most important characteristics a successful turkey hunter can posses, and many veteran hunters pride themselves on being able to wait out a hung-up gobbler. But that's not real patience, and here is one of the great ironies of turkey hunting.
Most turkey hunters are deer hunters, and vice versa.
A patient deer hunter can sit in one spot for four, five, six hours staring at the empty woods and waiting for a buck. Put that same guy in the spring turkey woods and he'd be hard pressed to sit for much more than an hour. Yet that can be a great way to take a late-season bird. If you can locate some birds using an area with any regularity, set up your decoys and sit tight, calling every 15 or 20 minutes. Don't be afraid to sit for several hours, even an entire morning.