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\section{Abstract}  Using an antenna to generate whistler waves in a plasma using helium a source gas and a magnetic field probe to measure perturbations in the magnetic field, a biased disc was placed in front of the wave generator to create ducting. The index of refractions, $\eta$, were measured and compared to theoretical values . A simulation was also created using exact theory to compare with measured results. The measured results were found to be $\pm (some amount) $ off of the theoretical value.