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.