Used this to test the range on from the R/F board to sensors.

http://i12.photobucket.com/albums/a231/silbowhunter/th_X10RangeTest.jpg (http://s12.photobucket.com/albums/a231/silbowhunter/?action=view&current=X10RangeTest.flv)

You need to load that cord a bit more, and pull a pin when they're on the corn. Like a squirrel slingshot. LOL