The transmitting and receiving antennas in a wireless communications system are quarter- wave monopole antennas with an efficiency of 97%. The antennas are polarisation aligned, and are located 2 km apart. The power at the receiver is 80 dB smaller than the power at the transmitter. 1.a Assuming the antennas are matched to the feeding transmission line, what is the operating frequency of this communication system? 1.b If the feeding transmission line to both antennas is changed to a 100 ohm line, what is the power at the transmitter if the power at the receiver is 3 W?