You can directionalize the antenna to help get greater range. There are also some antennas that are better than others you could try. Otherwise use repeaters.
An amplifier makes a copy, or a series of copies, of the input signal, Successive copies are larger, either in voltage or current, than the predecessor.
A transistor controls the flow of current between the emitter and collector.The larger current is supplied by the power supply, across the emitter and collector.The flow is then controlled by a small...