A resonant ,lossless(ecd=1) half-wavelength dipole antenna having a directivity of 2.156dB,has an impedance of 73ohms and is connected to a lossless,50 ohms transmission line.A wave,having the same polarization as the antenna, is incident upon the antenna with a power spectral density of 5W/m^2 at a frequency of 10MHz.Find the received power available at the end of the transmission line.