[en] The electrostatic screens for the A₁ JET ICRF antennae are required to be water-cooled in order to extend the pulse length to 20 seconds. Whilst many features found beneficial in the uncooled (Asub(o)) antenna have been retained, the provision of cooling, improvements in shape and interfacing with the toroidal limiter have much increased the complexity. The screens are fabricated in high purity nickel and manufacture has involved the development of machining, forming and welding processes to obtain the required mechanical performance. Tests of samples, a short proof assembly and a prototype screen have qualified the design and manufacturing processes. Magnetic forces during disruptions are reduced by the use of resistive electrical contacts, and the screen cooling is also used to cool the antenna side protection between pulses. (author)