My chickens live in a chicken tractor and their feed is in the run part of it. There is a roof over it, but it always gets wet if there's more than a sprinkle of rain. Putting it in the henhouse is not an option-there just isn't room. I know there are range feeders that might work, but they are too big and expensive for my little flock. Is there any other way I can keep it from getting soaked?