The only way you can protect yourself from the nazi thugs is to have a locked gate. Put a fence around the property and a locked gate for the driveway. They have to have a search warrant to cross any locked area.
Or buy one of these.
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http://www.thejammerworld.com/product_GPS_Jammer__page_1.html 
And thats the real funny part of the war against the nazi thugs. These are illegal but its legal for them to spy on you.