To find the fox you need to build a directional antenna. Yagi is usually used. Test the antenna after you build it, an make sure it is DIRECTIONAL. A friend of mine built, i think the world first omni-directional yagi.
Below links to some sites to help you build a yagi. Take care building it, measurement must be precise. If you are the adventurous kind, check the net to build an attenuator. This will help you find the fox more accurately.
Tape measure Yagi
http://home.att.net/~jleggio/projects/rdf/tape_bm.htm
http://www.open-circuit.co.uk/tape.php
Attenuator
http://home.att.net/~jleggio/projects/rdf/p_atten.htm
http://home.att.net/~jleggio/projects/rdf/a_atten.htm
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