Roof Aerial help

[Eddy]

Hello everyone

i have just purchased a 2011 Vauxhall Agila for the wife however the aerial was missing so ordered a new one Went to thread onto the car and it looks like the threaded part to screw aerial onto has broken off Can you purchase just the threaded part or do you have to go down the line of ordering a full replacement If a part can be ordered what’s the part called All your help is aporeciated

thanks in advance to you all