Kite Power Systems present technological advantages over traditional windmills. In this work, the design of a dual wireless link for kite applications requiring high reliability and low delays is presented. The link provides realtime data exchange between the system components that allows researchers to run closed-loop controllers, and to validate kite models. The proposed solution meets the quality of service requirements (delay and packet losses) and other requirements specific for airborne wind energy applications like small form factor, low weight, and power consumption. The most relevant design choices for frequencies, devices, and configuration are described. A pair of controllers for flying crosswind were tested under different QoS conditions with positive results. Performance measurements during flight were used to build statistical models. Such models were implemented in a simulator to better understand the effects of the network over autopilot controllers and to find the minimum communication performance requirement for the system.