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This paper will consider the various types of data links to Remotely Piloted Vehicles. The factors affecting their design will be explained and the important parameters and problems highlighted.The actual and potential roles for RPVs are well established, whether they be military or civil surveillance, or crop spraying. The information to be transferred between the ground terminal and the RPV or between RPV and RPV will depend largely upon the type of mission. This will impose the biggest constraint on the link design.