We present a detailed formalism allowing analytical calculations of the radiative properties
of nanoantennas. This formalism does not rely on dipole approximations and utilizes
multipolar multiple-scattering theory. The improvement in both accuracy and calculation
speeds offered by this formulation provides significant advantages that are used in this work
to study Yagi-Uda-type nanoantennas. We provide a study that questions the necessity of
the reflector particle in nanoantennas.