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My question is, can I run 2 DSL modems off one phone line?
No. DSL is a point-to-point protocol at the hardware level. It permits exactly two endpoints to the connection.
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You can get wireless repeaters. I have a D-Link, though I don't use it as a repeater. (This particular model can act as either a repeater or an access point.) Alternately, you can improve the wireless signal through positioning of the access points, and/or an external antenna. A directional antenna pointed at the other unit should do the trick if you are just on the edge now.