Alrite mate, When we are decoying we like to set them out in a horseshoe pattern just like the pigeon! That way we find that you can get them to flight in where you want them! i also like to make my pattern quite big with a varietey of teal mallard and widgeon deeks! i Just do this to make the ducks feel confident to drop in! Most of my decoying is done on the estuary and rivers and that seems to work for me but whether the same things applys to lochs and lakes i dont know!! Im sure others will let you know there ways for decoying but thats mine. Hope this helps!!
Happy:hunter: