Configuration for WLAN expansion

I am setting up a WLAN consisting of 1 AirPort Extreme as a basestation and 2 AirPort Express. One works as an extender, the second one as a „receiver“, that is connected to the PC with a normal LAN-cable.
As an alternative, I will try to set it up with 1 AirPort Extreme as a basestation and only one AirPort Express, which again will be directly connected to the PC with a LAN-cable.
Here are my questions:
- The 2.4 GHz frequency band works fine. How do I configure it, that it also works with the 5 GHz frequency band?
- I know there is a drop in wireless speed from one AirPort Express to the next. The internet connection is 100Mbit. At the moment, I get 20-25 Mbit down speed and 2,5-4,5 up. Is this realistic or what speed can I expect? There is a least one wall between the two AirPort Express.
- I tried to secure the WLAN by limiting the access on a MAC address basis. Where do I need to list them? Only at the AirPort base station or also at the each of the AirPort Express? Do I need to include the MAC address of the two AirPort Express in the list of the AirPort base station?
- Is there a tool for MAC OS X Lion to measure the WLAN strength? I’ve used iStumbler and it always crashed after a short period of time.

- The 2.4 GHz frequency band works fine. How do I configure it, that it also works with the 5 GHz frequency band?
You can't. The AirPort Express is a "single" band device only. It can receive 2.4 GHz or 5 GHz, but not both at once. I am assuming that you have the newer version of the Express here. The older version of the Express is 2.4 GHz only.
5 GHz can work well if you have line-of-sight between the wireless devices, but it does not penetrate any obstructions as well as 2.4 GHz. If you want to setup the Express to use 5 GHz, then you will have to assign a separate name to the 5 GHz band on the main router and then configure the Express to connect to that network.
- I know there is a drop in wireless speed from one AirPort Express to the next. The internet connection is 100Mbit. At the moment, I get 20-25 Mbit down speed and 2,5-4,5 up. Is this realistic or what speed can I expect?
Good performance if you are speaking about the connection to the AirPort Express.
- I tried to secure the WLAN by limiting the access on a MAC address basis. Where do I need to list them? Only at the AirPort base station or also at the each of the AirPort Express? Do I need to include the MAC address of the two AirPort Express in the list of the AirPort base station?
If you are using AirPort Utility 5.5.3 and 7.5.2 firmware on your AirPorts, you only need to setup the MAC Access list on your "main" Airport. The settings will auto transfer to the other AirPorts.
- Is there a tool for MAC OS X Lion to measure the WLAN strength? I’ve used iStumbler and it always crashed after a short period of time.
Sorry, I don't use Lion. If iStumber is not working well, you might want to take a look at AirRadar.
AirRadar 2 - Advanced Wireless Network Scanner

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