Excerpts from this story referencing "ETF tower":
"… es linking the tower to the MoD’s communication system.The hi-tech white ETF tower included eight floors of advanced electronic equipment and three floors of …"
"… of voice profiles to use in scanning international telephone messages.The ETF tower was operated by personnel from an RAF unit based in Malvern, Worcestershir …"
"… cations, including to and from Ireland.From 1990 until 1998 the Capenhurst ETF tower intercepted the international communications of the Irish Republic crossin …"
"… passes directly over the Wirral peninsula to the south of Birkenhead. The ETF tower was built to pop up into this beam.When the new cable was planned in the m …"