Is this case going to destroy my signal quality on my new S4?

http://www.ebay.ca/itm/Ultra-thin-Metal-Aluminum-Bumper-Back-Case-For-Samsung-Galaxy-S4-SIV-i9500-film-/380688801227?pt=US_Cell_Phone_PDA_Cases&var=650121056635&hash=item58a2d21dcb&_uhb=1

:S

I bought it anyways, but I wonder if I should get a plastic case just in case.