1) cats are visual... they don’t care about smell so much
2) Sneak, Sneaky, sneaky buggers. You may not see them come in
Best thing to do is study each row of stuff you are going to be looking at when you start calling, and then look for change. The little suckers will sit in a fence row and blend right in, and you’ll not notice them because they come in and sit down and watch. So make sure you look at it hard before you start calling..
3) They like bird sounds, and movement - even a feather on a fishing line works, but I use something high (in a tree) and smothing under it - like a fur decoy with movement.
That and what ingwe said.
