"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. It has a higher chance of causing and receiving adjacent and co-channel interference. 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.