[Point-MultiPoint] better wireless mode?

Hi,
sorry for my bad english.
anyway..
i have to do a point-multipoint network.
i have read wiki and mikrotik and forum but i can’t understand the better way to do it.

i can’t use nat, i would only ip on ethernet interface as management.
i have a router with two antennas, wlan1 and wlan2, and two client with only one antenna.
i wuold like to do a point from wlan1 on BSU and one client and other point from wlan2 and other client.
i have only 4 ip to do it.. is it right?

what kind of mode should I use on base station unit?
bridge? ap-bridge?

what kind of mode should I use on client unit?
station? station-wds?

I think to do BSU and client as Bridge, but then three antennas will be visible each others?

thanks and sorry for my confusion :S

re:

i have done a link with BSU in AP-brigde with WDS
and station set to statin-wds

i hope it’s ok.