You want to bring your hand up high. To make things easier, brush your thumb off your hip when you are bringing it back. If you do that, you won't swing out to the side as you are bringing it back. Give an open, flat target for him to place the stick. Don't grab for it!
Also, the incoming runner should have the stick out before he calls it. Otherwise he'll miss your hand. He should also point the stick at your elbow. If he does that, the stick should be good. So remember this;
1. Brush your thumb off your hip.
2. Flat, open target, and don't grab for the stick
3. Incoming runner should have the stick out before he calls it.
4. Incoming runner should point it towards your elbow!