Routers or cards?

Question

what is needed for a better signal a better card or router

Answer 1

i will have to say both. you must be able to send and receive equally for an increase in signal strength

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Answer 2

If you are referring to wireless signal strength, BOTH.

An 802.11g card will work with an 802.11n router but it will only connect at 802.11g speeds and distances.

So for best results get a new wireless adapter and a new wireless router.  Get both with the same brand name too if possible.