This whitepaper provides insights into the use, specifications, and impact of Radio Controlled (RC) Unmanned Aerial Vehicles (UAV). UAVs intended for recreational use are increasingly being used for other purposes. These include: observing/disturbing public events, spying in protected areas, smuggling contraband into prisons, endangering/threatening commercial air traffic, and entering restricted airspace. A technical approach for countering the threats posed by such drones is described, and includes: monitoring the spectrum for relevant signals, identification of frequency-agile RC signals, direction finding, and possible defensive countermeasures. Download the full white paper for more information.