A monopole type antenna suitable for operating in cellular frequency bands, the antenna comprising: a conductive surface forming a radiating element and including an electrical connection zone; a compact conductive counterpoise including a connection zone; and a feed line comprising an antenna cable connected to the connection zones of said radiating element and of said compact counterpoise. The polishing pad includes a polishing layer composed of a polymeric matrix and liquid microelements embedded in the polymeric matrix. The enclosure is configured to maintain a first air pressure inside of the enclosure that is substantially equal to a second air pressure outside the enclosure.