The basic theory of a receiving antenna is presented in sufficient detail to permit the calculation of the voltage across the load of an optimally designed TV antenna circuit. The rms load voltage is given by VL=λH(30RrD)1/2, where λ is the wavelength of the incident radiation, H is the rms value of the magnetic field intensity, Rr is the radiation resistance of the antenna, and D is the directive gain. The result obtained from this formula for a typical monopole TV antenna is compared with that obtained from a simple, intuitive approximation. The reasons for the difference in the results are discussed.