ORIGINAL: 123Splat
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I think the same logic follows for a recvr shield. IE: you would have to tie it to ground (Batt -) to be effective.
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Not sure. I don't recall that those who found it helpful tied it to Batt-, but perhaps.
I think a car blocking GPS signals is a good example of a Faraday-like cage that *isn't* grounded. Affects cell signals to some degree as well, but the towers are more "visible" through the windows than GPS satellites in the sky are.
And according to wikipedia (the fountain of all knowledge....or lies, depending on the last editor), a Faraday cage doesn't have to be grounded to work:
http://en.wikipedia.org/?title=Talk:...be_grounded.3F
D.