Yup, tried 'em all. 2 neighbors are broadcasting on #6, so I tried everything else. No luck.
After talking to Belkin tech support today (hint: If they list their tech support's number prominently on the front of the product box it means either 1) that you'll never get through to them; or 2) that their tech support sucks. My experience was the latter) and getting nowhere, I'm going back to the Linksys router and possibly a different PCMCIA 802.11g card.
I've got a Belkin 54 g. I can get reception all over my house, and I've never had to call Belkin support.