"I see a wide network. It says that it is using channel 11 + 7. What does that mean?"
40 MHz Channels, or "Channel Bonding"
With 802.11n, there are two possible channel widths:
|Channel Width||Channel Number Example||Notes|
|20 MHz Channel||Channel 6||Recommended in 2.4 GHz|
|40 MHz Channel or "Channel Bonding"||Channel 11 + 7||Not recommend in 2.4 GHz|
Using a 40 MHz channel in 2.4 GHz doesn't work well, because there just isn't enough room for it. In 2.4 GHz, we recommend using 20 MHz channels only.
The QA team with their 40 MHz channel. Ugh, you guys...
A 20 MHz channel. Much better.
Look for an option on your router to disable "Channel Bonding", or a "Channel Width" setting that allows you to select a 20 MHz channel. You can find out how to access your router configuration page here.