Suppose you have a receiver whose sensitivity is -100 dBm (minimum received power with which it can operate) and a signal is transmitted to it at a power of 1W. At both ends of the link there are antennas with 3dB gains; installed at heights of 5 and 1 meter, respectively. The stage is flat terrain with no obstacles. What is the maximum distance that   these transmitters can be separated? Assume an operating frequency of 700 MHz.

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