Although the sentence imposed on Roy Delph, of Kemps Close, Salters Lode, at Norwich Crown Court last Thursday was reduced from the normal five year minimum for possessing a loaded firearm in a public place, critics have insisted it was still too severe.
A campaign page demanding his immediate release from prison has already been set up on Facebook, while dozens have also signed an online petition supporting him.
And Delph’s wife, Jacqueline, confirmed that lawyers acting on her husband’s behalf are now preparing to lodge an appeal against his sentence.
She said on Wednesday: “They’re just waiting for Roy to sign the papers.
“They say you have 28 days to lodge an appeal so there’s plenty of time.”
The news of Delph’s imprisonment sparked an angry reaction from many on social media and has also raised questions about whether Britain’s current gun laws should be reviewed.
His grandson Guy said the family wanted to thank farmer Tony Martin, who claimed that Delph had been “let down badly” by the justice system, for his support.
And Mrs Delph said she had written to her husband to tell him of the support he was receiving.
She also revealed she had even received a letter of support from a person living in Glasgow.
She said: “I’m really pleased. They keep telling me to do it all to help him.”
Earlier this week, Delph’s friend, Tony Eagle, called for supporters to contact the area’s MP, Elizabeth Truss, urging her to intervene on the matter.
He said: “Everybody is saying how ridiculous it is. There’s nothing to be gained by locking an old gentleman up.”
Meanwhile, West Norfolk councillor Thomas Smith has also posted his support for Delph on Twitter.
He said: “I really do think that Roy Delph ought to be pardoned, he is an old man and didn’t actually point the gun at anyone.”
A campaign page, Release Roy Delph now, has also been set up on Facebook.
And almost 100 people have signed a petition on the Change campaigning website calling on the prime minister, David Cameron, to act to overturn the sentence.