Installing your own DSL on dry pair - what the phone company fears you will learn about
:
http://www.pbs.org/cringely/pulpit/pulpit20010823.html
Cringely is also the guy who connected two WIFI hubs (802.11), separated by miles, by simply using unidirectional antennas. Such antennas has been see for about $100 - more or less depending on frequency. Same low power transimitter that works on its ineffecient stub antenna at 50 feet can be made effective for a mile by using a Yagi antenna or equivalent.
Does one side need be a DSLAM? See the above cited URL from PBS.