We were driving east on a dirt road that separated Broward County and palmbeach county we were about 13 miles west of Hwy US. 27, in front of us we saw something about 1/2 mile away in our path. As we approached to about 100 yards away it was hovering about 20 feet above the surface, and began to lift to about 50 feet up it crossed a powerline and descended to about 30 above the graoun as we got closer to lifted up to about 80 feet and cross over a 500 kv powerline north side of us,, then dropped back down on the other side, staying about 15 to 25 feet above the ground we stopped my pickup truck and was watching it for around 3 to 5 min. The object just seemed to drift to the north and leave, It was bigger until we got closer to it , long in shape looked like a large person at times hanging from something,, then it turned an got narrower as it left , also at times was very bright like a mirror flashing in the sunlight.