That wireless stuff has an encryption feature but I doubt very seriously it would stop a savvy techie. About the only way to secure it is to have such a weak pityful signal that your freeloading neighbor can't pick it up
.
It also makes a BIG difference on range by what card you use and type of laptop you have. Some model HPs have sheilding that weakens the reception. We've been going through this at the firestation, lots of concrete and steel... (or is that
steal 
)