Does a case help improve Wi-Fi reception on iphone 4?

Does a hard case/silicon/bumper case improve it? And an article or two will help

Not at all I have an otter and it never strengthens or weakens my signal of my Wi-Fi now phone signal is deifferent because they say there's a part on the iPhone 4 where if it is touché it decreases your bars and says that you need to buy a case to protect it.

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