Send internet 4.41 miles using Ubiquiti equipment?

My parents have extremely limited internet options where they live, and I know a guy under 4.5 miles away that is willing to give lend out his internet connection.

internet is at: lat: 39.628096° long -77.409715°

Destination: lat: 39.628899° long: -77.327022°

I was wondering what (if any) equipment would be necessary in order to achieve my goal? I [was looking at this here](http://www.amazon.com/Ubiquiti-Nanobridge-NB-5G25-Outdoor-25DBI/dp/B004MYZ8U2/), and didn't know for sure if it would work, or if anything else was involved.. [like maybe something similar to this?](http://www.amazon.com/Ubiquiti-ROCKETM5-5GHz-Power-BaseStation/dp/B004EHUTNI/)

All new stuff to me, and I just want to get something working for them because they are frustrated paying so much for 40gb of data on an extremely slow 3g connection, and 4g is spotty most of the time.

Any and all help is greatly appreciated.

EDIT: Parents have a house that is set up on a hill somewhat and line of sight is "*sorta, maybe*". A long pole on top of the house is an option.

And also I would like to stay within the legal limits of power output, which I'm not exactly sure if I'm going to be anywhere near the limit or not.. again, any advice is helpful.