And ... further research shows that I probably do not have wireless N in my laptop. I would need a replacement card.

So - back to the drawing board. At least I'm getting better throughput, at least as fast as the hard-wired connection when I'm connected to the router.

I tried connecting to my server by copying over a large file using wireless, and I was getting about 3 MBytes/sec, so I guess I'm pushing G to it's practical max (which I assume is about half its theoretical max).

Fine for now. I'll look into upgrading as time goes by and I decide it worth it.