Do not use ant spray or any insecticide. It will deter the hummingbirds from coming, plus kill advantageous insects in the area. We have our feeder suspended on a wire that is hung from two trees, and do not have a problem with ants.
I am married with 4 grown children, and 5 grandchildren. I work as a fire restoration technician. I have a parrot named Buddy. I came across this site totally by accident while searching for some hummingbird facts. It looked interesting, so here I am.