The HYDRA Transmitter was a device that took down the communications of S.H.I.E.L.D..
History[]
In order to assassinate Patriot, HYDRA and the Watchdogs obtained a transmitter that took down S.H.I.E.L.D. comms. This allowed them to take down the Quinjet without Patriot, Phil Coulson, or Alphonso Mackenzie being able to make contact with base for rescue. During the battle, Mackenzie was able to take a grenade and throw it at the transmitter, destroying it.[1]