It is a satellite communications station - the 13th field station of the US national security agency. Menwith Hill is just a few miles from the Yorkshire town of Harrogate. The US military would link up with the UK on the project It is not so much the impact on the landscape that infuriates residents, but more what exactly the base does. It is a listening station, fitted with the latest technology. It also houses satellite tracking systems, which would be essential elements of George W Bush's latest plans.
Many people believe that puts the base at threat from terrorists.
Protestors are regularly arrested and charged, with breaking into the base, or causing criminal damage. Helen Johns was back in court again this week. She and a colleague broke through fencing at the base last year. She is a peace campaigner. But she also feels strongly about the potential threat.