> In Alberta one of the guys has had success with putting empty
> (unwashed) sardine cans on the wire.
 
Actually, when I was working as an inspector 25 or so years ago, *full*
cans of sardines were used.  One was attached to a fence wire on  each of
the four sides of the quadrangle.
 
Several nail holes were made in the lid to allow the smell out.  Similarly
nail holes permitted a wire to be threaded thru and attached firmly to the
fence (after all a can of sardines was 11 cents then, and who would want
to lose one to a bear).  The cans would last a season.
 
More details in the logs...
 
Allend