Most of the time they roost pretty close to the same area unless they are pushed out of their normal feeding areas. They do like to roost near water which is often a good tip. A side hill with large branched trees going up away from a pond is always a good spot. I normally like to get them when they hit the field at daybreak but in the woods also works OK but you just have to be careful you don't bump them out of the roost. Decoys work about half the time. I have had them come running in and other times look at them and work the hens away. If they seem to not be interested in closing the gap and are out of sight I call aggressively using cackles with a lot of volume followed up with yelps. If they don't come... move away and try again.