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What are the advantages of a "dual" band wireless router?

Hi Everyone;

        I am wondering what are the advantages of having a dual-band wireless router which transmits at both, 2.4GHz and 4GHz.  Are there more channels?  For instance, I have up to 11 different channels with my current 2.4GHz wireless router.  Perhaps the dual-band has more unique frequencies to choose from at 4GHz.  Does the dual-band router transmit at further distances and less vulnerable to outside interferences?  Of course, these are just "example" questions I have regarding the possible advantages of a dual-band wireless router.  

          In closing, any information regarding the pros of having a dual-band router will be appreciated.

          Thank you.

          George
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Hi Everyone;

       Thanks so much for the information along with the links.  I have a clearer understanding now of the 2.4GHz - 5GHz frequency bands of routers now.

        George