I personally wouldn't worry too much because I don't think the signal survives far beyond the immediate ring, so unless you're in a block of flats the chances of being intercepted are pretty much nil. Plus they are 256 bit AES encrypted end to end. None of my neighbours want to connect to my LAN that badly, don't know about you.
Does the device support that 3rd party firmware, er, dd-wrt? Much better than the original if so.