In regard to extending the cable between the pickup head and the circuitry, I was able to accomplish my goal. I wanted to use what I had on hand and not buy a pin pointer. I did extend the cable an extra 16 ft. A friend gave me one of the DIN connectors I needed, male, and I had a female. Got some CAT 5 cable from another friend and wired it all up. It is very possible CAT 5 would not have been needed and just any 4 conductor cable would have worked. I would never recommend this for any serious searching but all I needed was a "yes metal/no metal" indication and it certainly did work for that. It was on a 16 ft pole and I was able to discover the problem with an antenna that I had at 100 ft. Standing at the 100 ft position and reaching out 16 ft to the problem as with just the pickup heed, I wound say was real easy, but it was doable. I had the control head with me. Mike