Establishing A 1.5 Mi Link Between Houses?

I live in a very rural location with very few high speed Internet options.Unlike a lot of others, i have a relative 1.5 miles away who does have a high speed internet connection and is willing to up their package and split the cost with me. We've each gone up on our roofs with binoculars and confirmed we have a good line of sight, so setting up a long range point-to-point connection is what I am looking to do.

I already have a Tranzeo CPQ (TR6) to place on my roof (destination), so I just need something on my relative's house (source) to connect with.My initial thought was just to pick up another Tranzeo unit like mine from eBay for $100, but after doing some research, it appears the Tranzeo unit I have can only act as a client at the destination, so placing one at the source won't work ... or am I wrong here?

I have used my Tranzeo in the past over a much shorter distance (<800ft) to link up with a consumer Belkin N router, and it worked fine. For this new setup,I'm looking to connect the source's long range unit into my relative's router, then connect the Tranzeo on my roof to my router's WAN port.This way, my router will receive a DHCP address from my relatives router.