Wireless Network between buildings - Is my hardware sufficient? How can range be extended?

I am trying to create a network connection between two buildings that are across the road from each other. Currently, my internet connection comes into the basement of building 1 (wired) and connected to a DIR-655 router which goes upstairs (wired) and there is another DIR-655 router that spreads the signal to the other building. I have tested the network from the other building with a wireless G laptop, and it is able to pick up a weak signal.

Our internet source is switching to building B, and I would like there to be internet still in the basement of Building A. If I place a DIR-655 router into building B (the new internet source), will it be able to jump to Building A (upstairs) and then have a wired network working downstairs? My assumption is that if a laptop is able to bridge the gap between Building A & B, then the two routers should be able to bridge the gap also. Would this work or am I missing something in my logic, or my understanding of how the DIR-655 routers work? Currently the upstairs router exists to expand the wireless network and to provide connectivity through ethernet cables plugged into it. Is it possible to place a directional antennae into Linksys DIR-655 routers to strengthen the connection between the buildings?

Should I be looking at other hardware to add into the network? I do not want anything on the outside walls of either building, it has to penetrate both walls and bridge the distance without any hardware on the outside walls of either building (although the routers will be placed directly inside the walls). Ideally, I would like an internet connection in the basement of building A that has no packet loss and good latency on the wired computer. Should this work and what do I need to do (or purchase) to make it work better? Our reason for making the switch is that the new ISP can only provide access to the other building and the new isp will be a huge improvement over our existing one, but I am worried the wireless link will cause problems.  
aphoenixAsked:
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Rick_O_ShayCommented:
If those wireless routers will work in repeater mode you should be able to bridge between the buildings. Directional antennas will improve the signal over what you get with the laptop's internal antenna.

Just remember that the wireless signal will degrade going through each wall and window etc. Also be aware of signal affecting things outside like trees and bushes if there are any in the path from point A to point B.
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Ravi AgrawalCommented:
I would go towards adding a wireless repeater to your network. See these links too-

http://www.microsoft.com/athome/setup/wirelesstips.aspx
http://www.dailywireless.com/features/10-tips-increase-wireless-range-051007/

Ravi.

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aphoenixAuthor Commented:
It would have been nice if my specific hardware was factored into the solution (ie: DIR-655 routers) but I can try to figure it out from here. For example, does DIR-655 support repeater mode and what directional antenna would work well?
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SimpsonThePhilCommented:
You could always use good old trusted microlink, gigabit and as long as you've got line of sight faster and more reliable than wireless
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aphoenixAuthor Commented:
SimpsonThePhil, can you send me a link please?
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SimpsonThePhilCommented:
Hi,

This is just one in the UK http://www.buildinglinks.co.uk/laserproducts.htm

Just put laser link into google.
Phil
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Ravi AgrawalCommented:
Hi aphoenix,

Thank you for the points.

As per your closing comment, quoting it regarding your specific hardware was not relevant, as you can consider a repeater as something independent of the firmware / model of other routers on the network.

No offense please, but please consider the following-

It is the same as asking- Will my NIC work with my Router? Of course, it will ! it does not depend on the model of the router! A proper configuration on the Operating system is all that is needed.

Hope that makes it clear.

Ravi.
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