The flexibility of a control system can be improved by closing the loop over a wireless network. In these systems, however, the controller is generally assigned to the plant a priori. In this paper, a novel distributed control architecture called the broadcast control system is introduced. In this system the plant broadcasts its state to multiple controllers, where each controller makes a local decision to send back the control input. This allows the plant to use different controllers while moving. Moreover, the control performance can be optimized by exploiting the diversity of the wireless links. A contention resolution phase is introduced, which dynamically assigns a controller to the plant at runtime based on the wireless link quality. The coordinate descent algorithm is proposed as an effective way to optimize the thresholds of the contention resolution phase. The subproblem structure of the objective function is used to prove the convergence of the optimization algorithm. Numerical results show that the control performance can be increased by adding more controllers to the system, which is particularly effective when the link quality is poor.