For a scanner antenna you would only need one of about 3 lengths of wire depending on which band you wanted it for. You could make a low band vertical dipole with two pieces of wire about 5 ft long. For high band two pieces about 18 or 19 inches long. For uhf two pieces about 5 inches long would be best, and would do very well on 800. Just connect one piece to center of coax hang up and solder other piece to coax shield and hang down. Any longer wire wouldn't be very effective for scanner freq's unless you are looking for something for shortwave HF.