Make sure you do your SWR'ing in a large open area, not sure of how your drive/house is layed out, but I can't pick up bugger all outside my house becase there are too many houses in close proximity. Drive away from the houses and I can pick people up miles away - SWR also improves, although only slightly.
I get around 1.3 - 1.7 across channels and I'm happy with this, again with a PSM-1 mount and a small springer on a quick release.