Blue Bite executed a 14-day Shadowfencing campaign across Northeast markets to amplify Discovery’s wrapped Double-Decker Bus activation and extend the impact of the moving OOH placement into mobile. As the bus traveled through its route, Blue Bite applied a dynamic geofence that “shadowed” the vehicle in transit, identifying nearby devices within direct line-of-sight and delivering a complementary mobile ad message in real time. The campaign focused on television viewers with an interest in nature and history, using mobile engagement to reinforce awareness of the new Discovery series at the moment of physical exposure. Blue Bite also captured eligible device IDs for passback and supported tune-in measurement through a third-party pixel, enabling performance evaluation beyond basic engagement. Creative A/B testing was used to compare ad copy and identify the best-performing message for tune-in activity, demonstrating how Shadowfencing connected moving OOH exposure, mobile reinforcement, and measurable viewer response.