I have for sale the rotor unit only for an Alliance U-100 antenna rotor. Years ago when I had the control unit it worked fine, but the control unit is missing so I can't confirm its operation. This unit is popular for light duty antennas and AZ-EL (azimuth, elevation) use for sat arrays. Picture at: http://picasaweb.google.com/Sacramento.Cyclist/U100Rotor?feat=directlink Control units are available on e-bay, or you can build one from info on the web. 40ドル plus shipping from 95608. Email with questions. Thanks -- Dennis L. Wade KG6ZI Carmichael, CA