I used chainlink fence posts for my tower. It's about 30 feet tall and has never once threatened to fall in the wind. I have a couple of guy wires on mine as it's free-standing. However, if you put it up against your house all you'd need are some strong brackets to bolt into the wall.
In memory of Christopher James Roy, killed in action, November 28, 2005, and Eric Harless, taken by cancer April 29, 2006. We hardly knew you. May you each rest in peace.