The following from Optitackle's website-
"7. Copper Wire - We fish the copper wire similar to the way we fish Leadcore, straight out the back of the boat or segmented and used on Off ShoreTackle planner boards. The copper wire should never be attached directly to the board, only to the backing. Our copper wire rig consists of 300' of copper wire which is tied with an albright knot to Power Pro/Spectra backing. Usin 20 lb mono or fluorocarbon line for a leader. Our experience indicates shorter leads on the copper 15' or so for Opti's and flies, and 30' to 50' leader when using spoons. A snubber is usually not fished with copper wire.
Just like leadcore - "No hook set" copper wire is very soft. Just reel when a fish is on. We do not recommend it being used on dipseys or Thumper rods. The copper line sinks faster then the leadcore line, approx. 5'-6' for every 10 yds at typical trolling speeds and allows you to reach the deeper fish. At speeds 2.6mph and faster you will get about 5' of drop. At slower speeds you will get about 6' of drop.
When used on boards we recomend using in segmented fashion so you can hook your board to the superline backing, caution should be used if your attaching your board to the copper itself, the copper line is soft and it can fray or become weakened. Advantages - sinks deeper then leadcore, costs less then leadcore, no special roller guide rod is needed, a regular rod will work just fine as copper is very soft, twillie tip or a roller tip on the end would help but not necessary and it is more safer to handle then lead"