Statement

An important relationship in antenna theory is

$\displaystyle \boxed{%
\ensuremath{A_\ensuremath{\mathrm{eff}}}(\ensuremath{\n...
...\Omega_\ensuremath{\mathrm{ant}}}(\ensuremath{\nu}) = \ensuremath{\lambda}^2,
}$ (77)

where $\lambda$ is the observed wavelength.