Go with a Box call, a slate can be complicated when not conditioned right. A box is easy to use and make the different sounds with such as purrs, yelps and cackles. You don't need to get an expensive call, just pick up a cheap one from Primos or HS Strut. Another good thing about a box is its much easier to control the volume of the call, which is nice for windy weather. When the wind is blowing hard just add a bit more pressure on the paddle to increase the volume to break through the wind.