says up to 3km range...
But you would need CLEAR line of sight with the target.
Now then... The quality probably wont be as good (because broadcast strength will be significantly weaker), but I made a MUCH less expensive setup a number of years back for a friend of mine, who needed a Point-Point wifi solution to get internet in his house next door to his Dad's house. (lives next door.)
I used one of those parabolic shop-lamp metal clamp-on shades, some white epoxy putty, the screw-end from a broken lightbulb, a USB extension cable, and a USB wifi dongle.
I used a flashlight to measure where the focal point for the parabolic reflector shade is, and manufactured it so that the antenna inside the dongle is directly inside that focal point. (this assures proper beam concentration and beam formation for point-point connection-- This is already done with the expensive professional offering.)
The DIY antenna gives a good 300% boost on signal fidelity, and we were able to pan it around and see access points from around his neighborhood. Was pretty cool.
These days, many routers have options to stick such a dongle on via the USB port (especially if they support either OpenWRT or DDWRT) and then bridge the connection. Using the extender cable and the ghetto-blaster style reflector dish on, you could clip it to an upper story window frame (or if you live in an apartment in a major metro, and live way up high, just out the window and down toward your target...) then feed the cable to the router, and call it a day.
It's gonna be janky as hell though.
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