Ms John, 74, a founder of the Greenham Common protests, is demonstrating against the use of unmanned military aircraft.
Accompanied by her “Heinz 57″ dog Charlie, who is nearly 17, she anticipates being there indefinitely. She cooks meals on a camping stove and pegs her socks out to dry on an awning’s guyline.
Banners are displayed from her pitch which include the words: “Grim reaper drones smash flesh and bones in oil rich lands far away, guided by geeks, computer freaks.”
Ms John is opposed to RAF Waddington’s involvement with Reaper drones, which are used in Afghanistan.
The aircraft – remotely controlled by pilots on the ground – are used for surveillance and armed with 500lb laser-guided bombs and Hellfire missiles.
Ms John accuses the military of being assassins and claims that killing by remote control is a Nazi trait simply brought up to date.
She says the origins of drone aircraft lie in the V1 rockets which the Germans used to terrorise Britons in the Second World War.
“What’s happening now is history repeating itself but we have to stop making the same mistakes,” said Ms John, who stood against Tony Blair on a No Star Wars ticket in the 2001 General Election.
“Another generation of young men and more lives lost.
“Doing things by remote control is like playing a game. At least the men of Bomber Command put their lives on the line when they were killing civilians in the Second World War.
“I lived through the Second World War and it was not unusual to have a friend not turn up after an air raid.
“I have been a nurse and a midwife so I have this capacity to save lives.
“Here I am in Lincolnshire in this green and pleasant part of the world – can we not move into the 21st century peaceably?”
Crews from 39 Squadron, which has its headquarters at RAF Waddington, have been piloting drones from a base in Nevada, USA, for several years.
No 13 (Reaper) Squadron is expected to become operational at the base in November this year, which means the planes will be controlled from the UK for the first time.
Ministry of Defence spokesman Suzanna Brookner said: “The MoD only operates its unmanned aircraft in Afghanistan to support UK and coalition forces.
“Reaper is the only remotely piloted aircraft that is armed.
“The vast majority of unmanned aircraft flying is surveillance and reconnaissance in support of our front-line troops.”