I would think a base is all you need. My opinion on repeaters is; if you're going to put up a repeater put up a real repeater. Put it up high, whether on a tower or large building, but get it up there. 40 foot is better suited for a home base station, my thoughts are a repeater should be 100 feet or more to make the effort worth it.
I would go with just one of those Wouxons, good feed line and antenna. Try that first.