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Xfinity using WiFi signals in your house to detect motion
(www.xfinity.com)
This is a most excellent place for technology news and articles.
I can't get anything cheaper than that because it's a price I got when the reseller started business and as long as I don't switch, I get that price.
Good for you that you can get better, but coax still has its place until internet providers up their game, but I won't hold my breath.