LORAN antenna difference?

Can someone tell me the differences between a loran antenna and a comm or VOR
nav antenna? I guess what I'm looking for is why they would not be
interchangable, i. e. is the loran signal totally incompatible with others? is
it an absolute necessity for a preamp in the loran antenna (I would assume that
would eliminate the possibility of using that antenna to transmit, for
instance)? can a loran signal be received off of a dipole nav antenna? I'm
basically trying to be a little more knowledgable on the subject.

Jim