rewrite: When a signal reaches a receiver antenna that is specifically designed to receive signals of a particular frequency, the electromagnetic field radiated by the transmitter causes current to flow in the antenna 12. The receiver antenna feeds the signals into a tuning circuit inside a radio receiver, which is designed to "latch onto" one particular frequency and ignore the rest 1. The radio then filters and amplifies the signal it's looking for from all the other signals coming in on the antenna 2. The gain, directivity, radiation pattern, and electrical impedance of an antenna are the same whether it's used as a transmitting antenna or receiving antenna 3