A $1 \mathrm{~km}$ long microwave link uses two antennas each having $30 \mathrm{~dB}$ gain. If the power transmitted by one antenna is $1 \mathrm{~W}$ at $3 \; \mathrm{GHz}$, the power received by the other antenna is approximately
- $98.6 \; \mu \mathrm{W}$
- $76.8 \; \mu \mathrm{W}$
- $63.4 \; \mu \mathrm{W}$
- $55.2 \; \mu W$