Extra exam question E9B07

WhyA lossless antenna with gain and an isotropic radiator, driven by the same power, radiate the same total power. A lossless antenna with gain and an isotropic radiator, both driven with the same input power, radiate exactly the same total power overall, gain simply redirects that same total power to concentrate more of it in certain directions at the expense of others, it doesn't create additional power, answer C. The directional antenna's power isn't literally increased by its gain figure or its front-to-back ratio, and it isn't the isotropic radiator that ends up ahead by 2.15 dB, that figure describes dipole-versus-isotropic gain, not total radiated power.