The real truth is that directional antennas are intended to be used in a frontal direction, and any suggestion that any channel in a direction more then 20 degrees out "will come in" is dangerously close to real bad advice. The folks that I deal with are typical of the askers on this site and they do not use the rotor to surf. They use it as a tool to correctly aim the antenna to the group of stations that they watch.
A rotor in an antenna system is never bad advise.
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