So you're basically looking for a wireless USB adapter correct? You want to connect your laptop to the NCE controller upstairs and leave the laptop downstairs? I'm in IT and have not heard of such a device nor seen one out in the wild. There may be such a device but I wouldn't put much trust in it.?
Depending on length and house configuration they do make 50' USB cables with a booster. I've used them for printers in extreme circumstances.?
Wayne Swearingen