This may cause your connection speed to go down
Or somebody could steal your unencyrpted signals and gain personal information.-credit cards-
That's not all somebody could log on to your wifi and do something illegal and the feds would track it back to you!
all this can be prevented by efforcing wep and wap.They are encryption tecnology that requires a password for internet access.
you may think you would notice a stranger with a laptop standing outside
But with homemade antenas you could get easily get signals up to 1.5 miles away.