In areas with very weak signals you would need to use a pre-amplifier first to boost the signal levels up to a point where they can be distributed.
Distribution amplifiers are available in many configurations.
There are distribution amps designed to cover just off air frequencies and those designed to cover off air and cable frequencies. Variable gain control. This unit has a higher input capability so it works better than a higher gain amp in some cases because it wont overload. Variable gain control. Variable gain control.