Why can't my MacBook Air connect to Internet?

I'm at my Dad's for the holidays. I normally connect my MacBook Air to his Wifi router without any problems. But now I can't.
Here's what I do to connect:
Apple icon>System Preferences>Network>Choose his network name>Assist me>Assistant
This gives me the Introduction window with a present location name. I click Continue. The "I use AirPort to connect to the Internet wirelessly" radio button has been selected by default. I click Continue.
I select his wireless network name and put in his password.   The "Ready to Connect" window comes up and it tell me I am ready to connect to his network. I can see the wireless icon in the upper right corner of my top window pane searching for the signal. At this point in the past, this is where it has locked onto the signal and given me Internet.   But it gives up after a fews seconds and I get a greyed-out exclamation point.
I click Continue and I get a new window saying, "Unable to establish a network connection."
So I don't know what to do. I use his laptop to connect to the Internet wirelssly without any trouble. I have tried connecting mine sitting right by the router with no luck. As I said, in the past, I've had no problems connecting.   As far as I know, nothing is different with my laptop and nothing is different with my Dad's setup.
Does anyone have any good ideas? Troubleshooting?   Thanks.

Hold down the option key and select the Wi-Fi menu in the menu bar. What values are shown for the following?
PHY Mode
Channel
Security
Signal/Noise or RSSI
Transmit Rate
Please do not post the BSSID, as that information is private.
Now hold down the option key again and select
 ▹ System Information... ▹ Network ▹ Wi-Fi
Compare the two-letter Country Code with the ISO code for your country. Does it match? The code X0 means that the country couldn't be determined. The code X3 means South America, not otherwise specified.

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