Hi Beswick and welcome to the forum.
Comon opinion is that the supplied antenna is very good, but not suitable for outdoors.
So unless you can gain extra height or a better position with a new antenna, I wouldn't bother. And only consider a preamp in very diffficult circumstances, such as needing a very long connecting wire, and even then only if you can fit the preamp at the masthead.
Hope that helps.
Rod