is it possible, or just a dream?

Hi all, i`ve not much experince about wireless antennas, i wish to have
ur help, in order to understand how many antennas i may need. My
situation may be described as it as follows (let`s talk for one house
at the beginning): DSL 1.2Mb-> Cable Modem -> Wireless Router (Belkin).
Where i`ve the wireless router i use my laptop for working (wireless).
I wish to know, if ther is a way to extend the range of my signal up
to 1.5 - 2.0 Km where i`ve my office and no BB service. Between the 2
building there are some houses. The questions are: A) Do u think it`s
possible to extend the range of my wireless signal? How?
I need to get a very good signal.
Thanks a lot,
Vinnie