I tried the round reflector on a plastic stick thing, but the dogs mistook them for popsicles so they didn't last long. Then I tried the fiberglass rods with tape on top. They worked, but about that time I noticed natural markers that worked even better, i.e., back up in a straight line from the house toward the trunk of the mountain ash till you're abreast of the garage, then right 15 degrees rudder and aim for the oak marks the outline of my driveway. Besides, they don't make those rods tall enough for the snowload around here!
Pete