Why not a client device? That is, those devices that receive the wifi and supply you with ethernet? I've used these for years since I can place in in the best location and maybe put on a better or directional antenna. Here's a starter links for you to learn more.
-> http://www.amazon.com/NETGEAR-Universal-Range-Extender-WN2000RPT/dp/B003VWZE7S/ (does both modes.)
I currently live in a cabin on our landlord's property; we can pick up his wireless signal (the cabin is about 30 feet away) but just barely, and I wanted to get a wifi signal booster to improve reception in the cabin. Only problem is I don't really want to have to attach a gadget to his router since it's in his house and everything, so I was wondering if any of the signal boosters on the market function "independently" or away from the actual router itself, i.e. in our own cabin. And if so are there any particular products/models to recommend. (Sorry if this is a dumb question, I've never had this problem before!) Thanks in advance.