Martins, anyone?

Martins can be tricky.  My parents have had a house up for as long as I can remember, and never successfully attracted Martins.  Those who have them, however, love them.  Placing the house in really open areas will have better results.  Following my series on birdhouses, here are 2 plans for Martin houses.

Source:

Schutz, Walter E.  1973.   Bird Watching, Housing and Feeding.  Milwaukee: Bruce Publishers