I have just installed a Channel Master 4228 antenna with a Channel Master 7775 amplifier. I also purchased a Channel Master mast rotator but it does not work, so I have to return it. I live in Ridgefield, Ct which is approx. 45 miles from the Empire State building. I receive (very good signal) Fox - DT and WABC - DT which are broadcast from the Empire State building. However, I cannot receive WCBS - DT or NBC - DT which are also broadcast from the Empire State building. Can anyone help me? I am at a lost why all the stations broadcast from the Empire State builing do not work.