Airport drop-off

Hi. I have a 13" MacBook Pro working fine with Airport. It is showing full signal strength and never drops off.
Next to it (literally 1 foot) I have new iMac that a) never gets above 2 bars and b) rarely stays connected long enough to send an email attachment.
I have read on other posts about manual set-up but when I go into Airport Utilities and it scans for an Airport device, it finds nothing (message: '....unable to find any AirPort wireless devices.'. This is even though the display suggests 2 bars of signal strength.
Has anyone got any bright ideas?!
Thanks,
Tom

I have had a similar thing with my iPhone that wouldn't stay connected for long or wouldn't connect at all, and was able to fix it. I also have a 13" MBP that always connected fine. My iPad had the same problem as the iPhone but eventually would connect(sometimes) and was also fixed by what I describe below. Your problem might be related, maybe.
The first thing, you might want to make sure you have a strong signal to begin with; it could be that. If you have a strong signal and if you are on an a/b/g network then changing it from channel 1 to 11 or from 11 to 1 might help. You might be getting interference from something and it might help by changing the channel.
If none of the above works, you can try the following, which is what I did to get my iPhone and iPad working. First some questions: Are you using a cable modem? The reason I ask is I didn't have the problem on DSL only when I went to cable. Are you using Airport Extreme Base Station?
This is what I had to do to get my iPhone/iPad to work. I had to disconnect my Cable modem from my Airport Extreme Base Station(AEBS), and restart the AEBS without being connected to the cable modem. Then I opened the Airport Utility and was able to connect. Inside the Airport Utility I selected the Internet icon at the top and changed "Connection Sharing" to "Share a public IP address," then I clicked the update button, and let it refresh. Then I connected my cable modem to the AEBS and it all worked fine. If you try this, you might need to restart your computers after changing all the settings.
This may or may not help you. If you try it, just remember your settings so you can change it back if you need to. Try at your own risk! And if you do, make sure no one is using the internet or wifi when you disconnect it!
It worked for me, but you could have something totally different going on.
Good luck!

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