Dell Inspiron 5720 Wireless Card Replacement

I was given the Dell Inspiron 5720 laptop.  Upon testing it cannot connect to my 5GHz Wireless.  After further researching the wireless card in the laptop is only configured for 2.4GHz Wireless.  

My home Wifi has dual band 2.4 and 5.0 GHz.  someone suggested i replace the card with something like this:

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or

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Not sure what to buy, what are the advantages or disadvantages.  Am I better off with replacing the actual card inside the laptop?

Any help is greatly appreciated.