  
You have the best chance of
attracting martins if you put a house on the edge of a pond or
river, surrounded by a field or lawn. Martins need a radius of
about 40 feet of unobstructed flying space around their houses. A
convenient wire nearby gives them a place to perch in sociable
groups. Martins nest in groups, so you'll need a house with a
minimum of four large rooms -- 6 or more inches on all sides,
with a 2-1/4 inch entrance hole about an inch and a half above
the floor. Ventilation and drainage are critical factors in
martin house design. Porches, railings, porch dividers and
supplemental roof perches, like a TV antenna, will make any house
more appealing.
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