An object in the sky, such as an airplane or a cloud, can reflect a television signal back to Earth so that it mingles with the signal coming directly from the TV station. The weaker signal that results is called deconstructive interference.

A radio station broadcasting along a coast will employ wave interference to avoid the waste of sending signals out to sea. Two towers are spaced a short distance apart, and the currents in the antennae are made to peak out of synch. If this is done in just the right way, no radio waves are sent out to sea and the ones sent inland have twice the power.

When the waves in air pass into a chamber with the right shape, they can combine such that the waves seem to hold still without moving. This example of a standing wave is better known as music.

Light striking a thin film, like soap bubbles or oil on pavement, will reflect off of both the surface and the bottom of the film. Returning to your eyes just out of phase, the neutral light is remixed with itself producing a whole rainbow of colors.