I put them on the fence posts. Every couple of hundred yards will be two boxes on adjacent posts. If the Bluebirds take up residence in one, the Tree Swallows will nest in the other one without fighting the Bluebirds for space. Both Bluebirds and Tree Swallows will defend the nest from others of their kind, hence the spacing of a 100+ yards between pairs of houses.
Try to keep them in open areas about 4 ft. off the ground.
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