So, if I now were to ask for the gain of a parabolic antenna G of a parabolic antenna this would be eta times pi d squared by 4 into 1 over lambda squared by 4 pi so basically the effective area of a parabolic antenna divided by the area of an isotropic antenna.
इसलिए, प्रभावी क्षेत्र होगा, और ऐन्टेना का गेन होगा।