Airport express not found (by macbook) after moving to the US

Hi,
I unplugged my perfectly working AX (v6.3) in Europe, moved to the States and now have connection problems (same Macbook Pro, same AX). ISP here is Comcast.
Symptoms: The airoprt utility (AU) doesn't see the AX (whether cable modem is plugged or unplugged to AX). Reset or factory-reset of AX doesn't solve the problem. If I restart AX and then also the computer the AU sees the AX, but can't connect (connection timeout). After this first trial to connect the Macbook will not see the AX any more until I reboot the Macbook.
I can connect the AX via ethernet and configure it using AU. I did not set a password (for test reasons), connection mode is 802.11b/g compatible, channel auto, security none.
Also did a restart of the cable modem (unplugged for 10 min) like described elsewhere in the forum. No help. Anyway, if I am correct the AU should see the AX even without the modem connected to it, right? If I plug the modem to the AX and restart the modem, the LED on the AX will go green. Still it is not detected by the Macbook.
Any ideas highly appreciated. Thanks!!!
Message was edited by: Eppentorf
Message was edited by: Eppentorf

As Duane mentions, 5 GHz signals do not travel or penetrate well because the higher frequency signals in this band are absorbed by any obstructions much more quickly than 2.4 GHz signals.
Although not exactly true, unless you have close to line-of-sight between your computer and the AirPort Express, you will probably have much better results using the 2.4 GHz signals which penetrate more effectively and work greater at longer distances.

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