More on this - Some wifi cards are designed to work well for reliability(AKA be able to deal with walls, trees, etc) and some are designed for high speeds in low obstruction zones(AKA They work really well if they don't have to deal with walls, trees, etc but they are very easy to block with such obstructions) Their are some other design choices that can be made(such as energy usage, heat dissipation,etc) so please tell us what you want from your new network card so we can give you the best recommendation.