  Measurements with widefield radio interferometers often include the
near-infinite gradient between the sky and the horizon. This causes aliasing
inherent to the measurement itself, and is purely a consequence of the Fourier
basis. For this reason, the horizon is often attenuated by the instrumental
beam down to levels deemed inconsequential. However, this effect is enhanced
via our own Galactic plane as it sets over the course of a night. We show
all-sky simulations of the Galactic plane setting in a radio interferometer in
detail for the first time. We then apply these simulations to the Murchison
Widefield Array to show that a beam attenuation of 0.1% is not sufficient in
some precision science cases. We determine that the noise statistics of the
residual data image are drastically more Gaussian with aliasing removal, and
explore consequences in simulation for cataloging of extragalactic sources and
21 cm Epoch of Reionization detection via the power spectrum.
