+ 0 Votes Oh yes. mjd420nova April 4, 2013 at 2:44am PST All of the above. There are things you can do to make the infiltrators access harder to achieve their goals. One is the MAC address filtering but even that isn't that secure as the address can be spoofed. One way to limit outside access is to insure none of your WIFI signal leaves the premises. Working with a laptop outside the home could identify signal levels and changing position of the router and its antenna(s) can create usable signals within the home but not outside. Some signal peaking areas can be reduced with grounded foils to block signals in certain directions but this can also inscrease the signal in others and is all variable depending on the environment, wall insulation, wiring and innumerable other variables.