I need to extend wireless coverage through brick walls. It's inside a house and I replaced my old access point with a linksys WRT150N it's a wireless n router it boosted the signal a little bit. However, the coverage is still poor. There is no cabling in the other room where i need the signal at. I tried using 2 novatech powerline adaptors to setup an access point in the room with the need for wireless but it wouldn't work. The whole house is made of brick. How strong of a directional antenna should i get to send the signal to that room. The distance is about 100 feet from my wireless n router to that room.