How do I set Airport Express to work as repeater?

Question

How do I get my Airport Express to work as a repeater for my Apple TV, iPhones and iPad? I use a Mac Pro and a Netgear N300 Wireless N Router. The N300 sees the Airport fine and I can play music to the Airport from iTunes, but none of the other advertised features appear obvious.
All of my other Apple products sync to the N300 Router without issue and apart from some minor setting up to get it working with Apple TV, the N300 presents no compatibilty issues whatsoever.
When I purchased the Airport Express, I truly beleived that the Airport Utility Software, would allow me to choose whether I want to use it for Audio or USB or Repeating / Extending my network, by simply selecting the mode I required, when I required it. After all, isn't that the beauty of Mac computers?
Alas, there is no such drop down menu or button I can press in Airport Utilty to make such a straight forward selection. Instead, from what I can see so far in Airport Utility and various forums, there is a very long and painful process that must be carried out to use the Airport to extend my WIFI network.
I refuse to believe that it can be this hard and assume that that there is some really obvious setting I can change to make this work. It certainly wouldn't surprise me if Apple left this out of the manual, as Apple are legendary for not telling you how connect to 3rd party products, as I found with Apple TV.
As I said, I have read a million threads on this topic and all I have found so far are wanna be geeks, getting lost up there own a**es with lots of technical rubbish that has nothing to do with the problem.
If there is anyone there who actually knows what they are talking about and can explain this without Pythageros Theorem, I would be most grateful.

Answer 1

The AirPort Express can "Join" virtually any wireless network to provide AirTunes and remote printing capability. 
But, the "Extend a wireless network" function of the Express appears to be a proprietary feature that will only work with other Apple wireless routers.
As far as we know, this feature is not compatible with routers from any other manufacturers, so there is virtually no chance that it will work with the Netgear N300 router.
I refuse to believe that it can be this hard and assume that that there is some really obvious setting I can change to make this work. It certainly wouldn't surprise me if Apple left this out of the manual,
Well, you can try either the guided setup or the Manual Setup method to configure the Express to "Extend a wireless network", but you are going to get an error message that the "network cannot be extended".
If you have the time and wish to prove this to yourself.....
Open AirPort Utility - Click Manual Setup
Click the Base Station tab below the icons to name the Express, setup a device password and adjust Time Zone settings
Click the Wireless tab and adjust as follows:
Wireless Mode = Extend a wireless network
Wireless Network Name = The name of the Netgear network that you wish to extend
Enter a check mark next to "Allow wireless clients" if not already checked
Wireless Security = Wireless security setting of the Netgear network
Wireless Password = Enter the password of the Netgear network
Confirm Password
Click Update and wait for the error message