hi

i've put a nesting box on the side of my garden shed, too late to attract a resident for the winter. i decided to put a hook in the bottom of it to hang fat balls from for now. would this discourage nesting birds because of all the other bird attraction or disturbance it brings?

I'm also going to grow ivy up the shed, is it better to have a nesting box hidden to distract magpies etc?
thanks