Abstract: Webs carrying RFID antennas RFID modules support high-speed mass production of RFID tags. Preferably, a sprocketed web having a sequence of sprocket holes near at least one margin to be engaged by a sprocket drive in a machine carries a sequence of RFID antennas, and another sprocketed web carries a sequence of RFID modules. Each web may be advanced past a forming station at which a module is separated from its web and attached to an antenna on the other web. The process produces a web of assembled and packaged RFID tags. Optionally, during the process, before RFID modules are attached to antennas, data may be written to each modules and then read and verified prior to the forming station in order to test each module. A module with data failing verification may be removed from the process without being attached to an antenna.