I hope it works out for you. I had a similar problem, my wireless signal kept dropping (N+) going through two walls (from the living room to my bedroom), in the end i bought two reels of ethernet cable and some panels and put panels in the parts of the house i would need the internet. I put all the cables either under the floorboards or in the loft (depending where they were going).
Cables, crimps and RJ45 clips were too expensive and they werent difficult to put together.
i am anti-wireless to the max