A conspiracy theorist caused around £150,000 damage when he set a 5G phone mast ablaze in a bid to 'protect' others.
David Patterson, 41, had previously constructed a 'bunker' in his kitchen using tins and covered himself in foil in a bid to make a barrier against harmful 'waves' from the transmitter.
After breaking into the locked compound in Wardley Garage, Gateshead, Patterson admitted to setting fire to the BT phone mast on the roof - which cost between £100,000 and £150,000 to replace.
He said he was motivated to commit arson because he believed 5G was 'dangerous' and that he genuinely thought at the time he was 'protecting his family and others from harm'.
Speaking from the dock in Newcastle Crown Court, Patterson admitted his actions were wrong and said conspiracy theories 'don't apply to me no (sic) more'.
Newcastle Crown Court heard in the early hours of June 21 last year the 41-year-old climbed over a fence into a locked compound at Wardley Garage in Gateshead and set fire to a BT phone mast on the roof.
Prosecutor Alec Burns told the court: 'Police attended and they arrested him.
He admitted he had set fire to the mast, saying because it was 5G he believed it was 'dangerous'.
Mr Burns said there were two seats of fire and the mast, which was destroyed by flames, cost between £100,000 and £150,000 to replace.
Damage caused to the garage building is estimated to cost around £15,000 to repair.
The court heard at the time of the fire Patterson had the 'delusional belief' that he was 'protecting his family and others from harm'.
Judge Sarah Mallett said Patterson had previously 'covered himself in tin foil and had a self-made bunker in his kitchen'.
Judge Mallett added: 'His belief was the tins and tin foil would act as a bunker from the waves he believed he was experiencing from the 5G mast, furthered as it was, that belief, by material that is readily accessible on the internet that frankly feeds beliefs that are widely considered and accepted to be completely delusional.'
Patterson, of Pensher Street East, Felling, Gateshead, Tyne and Wear, admitted arson.
Speaking from the dock, Patterson told the court: 'I know what I did was totally wrong.
'Conspiracy theories don't apply to me no more. I am well aware my mind can't take it.
'I want to spend time with my lovely friends and lovely family now.'
Tony Davis, defending, said Patterson has been under the care of mental health services.
Judge Mallett adjourned sentence until October 1 and said although Patterson has made 'good progress' she has concerns about the future and wants more information about the mental health interventions available to the court.
The judge told him: 'I need to make sure the sentence I pass not only benefits you but, more importantly, benefits everyone by reducing the risks you have shown you are capable of causing.'
Patterson has been given conditional bail until the next hearing.
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