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
- $10$ Watts
- $1$ Watt
- $0.1$ Watt
- $0.01$ Watt