One simple way to attract ruby-throats is to build or buy a hummingbird feeder and fill it with a nectar solution. Providing a complete diet in your feeder is not essential, because the birds will balance their diets on their own. Locate the feeder where you can see it from inside your house. Sometimes the guards can be purchased separately.
Ants sometimes find their way to the nectar.
Coating the string supporting the feeder with petroleum jelly can discourage them. Make your own feeders Constructing a feeder can be an easy task. An empty pint milk carton can become a makeshift feeder. Cut large openings in all four sides, leaving an inch reservoir at the bottom for nectar. Attach bright red material to the bottom of the carton to attract the birds.