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The standard incarnation is a generic rf detector/level meter with an antenna that is tuned to 2.4ghz.

The Basic Circuit
(Back the url up one dir for datasheets and pics of one hobbyists's implementation)

And another version using a pic instead of a dedicated display driver chip.

Here is some more information on hidden camera locators:

http://www.dafh.org/gbppr/mil/hidden_cam/index.htm l

You can buy a handheld SpyFinder. Here's a customer review with a discussion of how it works. It uses two lasers, one on the optical axis and one slightly off it, run alternately at a few Hz. Things that have focusing optics followed by a flat reflective surface (which includes most cameras) will blink. Ordinary shiny things will not.

Here is a homebrew Al-Jazeera satellite jammer project:

GBPPR Zine 8

Open Source Defense Electronics

Here's a link to another little low power FM broadcasting setup, using higher quality hardware.

Frank Jones is a known con, in fact, he's in jail right now.

Here's a much better website on van Eck phreaking:

van Eck-style Radiation Interception Experiments

van Eck-style Radiation Interception Experiements

Here's a website describing some Old School Hacker Tools

Check out this website covering Old Skool Hacker Toolz from the early 1990s.