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A transmission line is feeding $1 \mathrm{Watt}$ of power to a horn antenna having a gain of $10 \mathrm{~dB}$. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free-space is

1. $10$ Watts
2. $1$ Watt
3. $0.1$ Watt
4. $0.01$ Watt