ismcctv

Im running 7 cameras on an 8 channel 12V DC 4.2 Amp Power supply; ( to the DVR ) all cameras are running on cat5 cable to Video Baluns. however 1 camera is giving me lots of problems, the length on this particular camera is 180 ft. it has 2 splices on the cable ( im running the orange pair for video & the green pair for Power ) i am getting a distorted image with lots of interference i can see the image but with lots of wavy lines. any recomendations as to what i am doing wrong?