1 votes 1 votes At $20 \; \mathrm{GHz}$, the gain of a parabolic dish antenna of $1$ meter diameter and $70 \%$ efficiency is $15 \mathrm{~dB}$ $25 \mathrm{~dB}$ $35 \mathrm{~dB}$ $45 \mathrm{~dB}$ Others gate2008-ec + – admin asked Sep 17, 2022 • edited Feb 14, 2023 by Lakshman Bhaiya admin 46.4k points 30 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.