FWIW, My Obi100 didn't like the long length of the house wiring. I had been using it (and still can) with a GVMate dongle. The beauty of the Obi is the small size, and no computer needed (unlike the GVMate). I put it on the Ethernet hub on the other side of the house and hooked it straight in with a short cord to the cordless phones and it's actually better that way.

If you can hook it up that way I'd advise it. It seems sensitive to 50+' line lengths.
The Crazy One