Freestanding towers, guyed towers or guyed poles may be used with wind generators. Wind generators can be mounted on freestanding towers designed for antennas. They require a large, engineered concrete base for support, but since they do not require guy wires, they can be installed in the smallest space. Guyed steel truss towers, also designed for antenna mounting, are less costly and require a large area for guy wire placement. A tilt-up pole tower is the most economical and the easiest to install. Wiring and mounting of the wind generator are done before the tower is erected. No climbing is necessary. Steel tubing can be bought locally to save freight. It is not recommended mounting wind generators on roofs. Though it is possible with a wind generator of 500 watts or less output, it will be noisy.