The Connector Bar helps connect 2 decoy spreaders together. Instead of 4 birds swimming around you will have 7 (or even more). The spreaders can be connected without the connector bar, but then you will only have 6 ducks.
Shy ducks would not land in our decoys. We tried more decoys, less decoys, fancy decoys, calling, not calling, jerk strings. Nothing worked. When we built our spreader and threw it in the water the ducks cupped up and barreled in, acting like it was opening day. That is how Motion Ducks was born.