Snapped Aerial

[Mark]

My aerial snapped off today whilst driving, which made a horrible noise on the roof as I assume it flipped over hitting the roof several times!! It has snapped really close to the base where it must have rusted through. Since it's rusty and so close to the base, I doubt I'll be able to get the remainder out to fit a new mast so it's probably easier to replace the base as well (and fix the rust on the roof around the base too while I'm at it).

Does the base simply unbolt from the inside of the car behind the interior light?

Thanks