If the person is a real ham, they would not live anywhere there was a restriction or a covenant.

The closest thing I have seen to a fold-able antenna would be the Stepp IR antenna - which is a piece of junk in my opinion.

It is a beam antenna on one band - 20 meters I think and is a portion of wavelengths of a dipole antenna everywhere else it operates.

It works on a principal similar to the ribbon track that raises and lowers the side windows in automobiles.
Eventually the stepper motors breaks or the ribbon track breaks and you end up with a pile of very expensive junk!