Radon in a home

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Has anyone had any experience with radon in a home? The house I'm looking at in foreclosure up for sheriff's auction next week has one of those gadgets coming out of the basement with some kind of fan/blower. I'm not sure if this is something that has to stay on the house or if that can be removed. I don't know much about radon and what is really required, if anything, for it. Anyone have any suggestions?