You are standing right at the midpoint between two radio antennae, which are emitting the same signal. At this point, the strength of the signal detected by your radio is a maximum. You walk towards one of the antennae, along the straight line connecting them. As you walk, you detect points of maximum and minimum strength, until you reach the third maximum after walking 3.0 m.

What is the wavelength being emitted by the sources? Give your answer to two significant figures and with units.