Poor WiFi connection with iPhone 4 (iOS 4.2)

Hello,
I am regularly testing my internet download speed on my iPhone using Ookla's app 'Speed Test'. It used to be up to 8-17 Mbps. But since a few months it only runs on about 1-2 Mbps!?
I did not change my provider nor did my provider decrease the rate. The rate tested from my MacBook Pro is 32 Mbps.
Since I use a MacBook Pro (10/2008), another MacBook Pro (8/2006), an Apple TV and an iPhone 4 I have to set my AirPort Extreme to 802.11n (b/g compatible). I set teh channel manually to 12 since the Apple TV could not deal with automatic channel selection?! The Apple TV's connection speed is also very poor.
So does anyone have tips how I can improve the WiFi connection speed for my iPhone and Apple TV?
Thanks & best regards,
Manfred

menphrad@mac wrote:
So does anyone have tips how I can improve the WiFi connection speed for my iPhone and Apple TV?
Use the advice in this thread to investigate the signal and noise levels that each device sees:
http://discussions.apple.com/thread.jspa?threadID=2347845&start=1
With that information you can begin to understand the problem.

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