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I have a Buffalo Nfiniti router, and I am running dd-wrt.

My signal quality is at 40%, on my mac it is fine but a hp computer in another room has internet issues (the connection comes and goes etc.)

What options do I have with this setup to fix this?

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Here is a decent article that goes over several options, such as a repeater, signal booster, second access point, replacement antenna, etc.

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