dude, go with your wireless bridge. I have atleast 10 of these setup in the wild for clients using ubiquiti gear from 200ish feet to 1ish miles without issue. as long as you have LOS, and since you're so close turn down the gain, you'll be golden. i'd roof mount, but since this is just residential and you're apparently just helping someone out who doesn't want to pay for internet (or you want to LAN game/share) the wifi will be your Cheap/easy/good setup.