Wireless NIC for Laptop

I'm planning to get a new Mini-PCIe card to achieve higher speeds, but I have some questions.
1) What are the requirements for matching a NIC to a motherboard? (Just interface?)
2) Since my laptop originally wasn't dual band, can I install a dual band NIC it use it just fine or do I need a 3rd antenna?

I was thinking about using an Intel Centrino Advanced-N + WiMax 6250 http://www.ebay.com/itm/INTEL-CENTRINO-ADVANCED-N-WIMAX-6250-DUAL-BAND-WIFI-CARD-WLAN-622ANXHMW-/120880969135?pt=US_Internal_Network_Cards&hash=item1c251135af

Lenovo IdeaPad Z575 (A6-APU)
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More about wireless laptop
  1. instead of a PCI Express use a USB adapter. There more efficient and have faster processing.
    Good Luck!
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