The primary limiting factor on the range of your AE, even moreso than your home's metal framing, is the AE's location. It's important to have the AE in as central a location of your house as possible. Of course, this isn't always practical to do. In that case, I would recommend purchasing another AE, setting it up in WDS, and locating it midway between your current AE and the spot where you're having trouble picking up a signal. Do a search of the forum for setting up WDS. It's easy enough to do and it works great.