re: What's the best wifi range extender?

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In general it's better to put in a second access point assuming you can hard wire it back to the router. A repeater naturally slows down the conversation since it is relaying every message both ways.

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This.

If you can hardwire from your current router to an Access Point, do that for sure.

A repeater/extender doesn't require a wired ethernet connection, but it will cut your bandwidth in half. And wireless already runs in half-duplex mode - ie, sends OR receives, not both at the same time.

As for an actual repeater/extender, just go to newegg or amazon and search the ones with the best review/cost ratio. Neither Access Points or Extenders are expensive really for home use.