If you have two antennae, replace one with a direction antenna. Leaving the other as a omni-directional pole should give you a good area of coverage while the directional antenna serves to extend your wifi range to needed areas such as your backyard or that room down the hall and around the corner. If you only have one antenna, crack open the plastic casing on your router and look for a little socket for a second antenna. It’s cheaper for manufacturers to produce one hardware design and just downgrade the hardware to make more than one model than it is to have multiple, completely different designs.

I don’t know why I always forget how to do ranges, but I do. I guess it has something to do with the fact that I don’t expect it to be like C at all, and I don’t need to use it often enough to remember.