Hidden node

Hi !

Kindly, i want to ask your help for this matter i need in my company:

I need to setup the following configuration:

NODE     <-->   NODE  <-->     NODE
 A               B		C

A and C have direcctional antenas pointing to B. B has an omni antenna. 
All of the are AP (none are laptops or wireless cards).

Distance from B to A is about 550 mts (that's 1650 ft). Distance from B 
to C is 120 mts (360 ft). 

A and C doesn't have LOS. That's why i need to use B. It's something like 
this:

				 B
				|-|
				| |
				| |		 C
				| |		 -
 A				| |		| |
|-|                	 	| |		| |GATEWAY
-----------------------------------------------------------

I plan to use B as AP, and having A and C clients of B. As long as i 
remember this could create a problem known as the "hidden node" where A 
and C can't speak directly each other and can minimize performance. The 
problem is that what i need is connectivity between A and C mainly because 
A is a network with about 50 LAN users and B has only 8, but the gateway 
is located on C.

I read that by using CTS/RTS the hidden node problem could be cleared. Is 
this rigth ? will it work? i read to that this add a big overhead and 
possible delay. I only need about 1 mbps (but i would love to use 11 
mbps). In a near future i plan to add another D node in a very similar 
configuration to A (needing connectivity to C and no LOS to C, then 
pointing to B). Think of B as the main antenna because of the heigth 
(about 90 ft). A and C have about 21 ft and 30 ft each).

Finally, can someone tell me of having B as AP and all other as "AP 
clients" has the same performance and reliability than having B as bridge 
point to multipoint and all others as bridge point to point ? i would like 
to use AP mode because this way in the future i could have some occasional 
laptop users in the AP (B) area.

Thanks for any help you can give me. 

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