These people can't be for real, can they? I guess it's possible. I remember where I used to live, there was a lady, who thought the aliens were trying to read her mind, so she put aluminium foil up around her windows to block the aliens thought powers. She even wore aluminium on her person. She was the resident crazy lady.
I don't know how serious those people are, but this is a common symptom of schizophrenia. I have an aunt who is schizophrenic and she believes devoutly in these things. She told me that the IRS has pipes stuck up into the air to listen to us. She also thinks she's a close personal friend of George Bush Senior and that he would send the space shuttle to pick her up if she called him. It's very sad actually.
Those are the stupidest web sites I've seen in quite awhile! Anyone with the slightest hint of grey matter in their skull would know that this is rediculous. An old snowmobile helmet is the only thing that actually works because of the sparkly metallic paint they used to use. It scrambles the signals so that aliens can't even detect you. Anything made of foil will reflect about half of the telepathy signals, alerting the aliens to your exact location and your knowledge of their existence. They will eventually respond by abducting you! (I'm totally kidding everyone. Pure lead casted an inch thick is the only thing that works. )