If the antenna amplifier has been out in the weather for a long time it is likely bad. ALSO the coax that goes out side from the inside of the house is likely bad. I would connect the antenna with new coax and No Amplifier and see what you can get. The
http://forum.tvfool.com/showthread.php?t=460 rotor that sends every thing over the coax is a good rotor. Be sure and use coax that has solid copper center conductor wire. Not copper covered steel.