Router connection inquiry....

The following questions might seem a bit dumb but I would appreciate if
somebody could give me a hand.

We currently have two wireless 802.11g PCI cards and Belkin Desktop Antennas
connected to our network. We have another 3 or 4 potential users who we
believe are outside the range of the 802.11g PCI cards and Desktop Antennas
where we will base our ADSL connection.



1. As the F5D7230au4 has a range of 1800feer/540 metre range the
potential users would receive the signal, but can they send the signal back
to the base F5D7230au4 unit?



2. Will the computer at the central ADSL location require a wireless PCI
card or can it run straight from the F5D7230au4 unit?



3. Have I got the correct hard hardware?



thanks

Cam