Trouble with channels and clients using different 802.11 g/n adapters

Hi,
I have moved to a new home and I have a lot of problems with the wireless network
I have configured the airport extreme to use the "802.11n draft" with backward compatibility to b ang g at 2,4 GHz.
I had to manually select channel because the "Auto" option will probably use channel 6 and in this way all my clients are unable to connect.
After many tests I have found that I cannot use channels from 4 to 9 because my macbook airport card will not detect the wireless network. Channel 1 seems to be the best choice but it is used by other people in the near homes also.
With channel 1 my macbook is able to connect and mantain a stable connection, the signal is about 35%, unfortunally other clients (using windows XP, broadcom wireless adapter or a d-link DWA-140 USB key) are unable to have a good and stable connection: it is always "low", "very low" or not available
Using the D-Link DWA-140 wireless config utility I have discovered today that channel 5 seems to be the better for such device: using channel 5 it is able to connect windows clients from everywhere with good or excellent signal BUT my macbook wireless results completely dead instead :-/, the same for broadcom client.
D-link is unable to connect if I set channel 6 to 9 also.
Macbook is unable to connect to 5GHz 802.11n pre-standard, D-Link is able instead.
I have no cordless phones or running microwaves in the kitchen, the only thing I have is an home alarm using infrared and microwave sensors in each room. But they told me that they are using a frequency range much different from 2.4 GHz. Unfortunally I am unable to completely power off them and test some more.
May be that near homes have cordless phones, wireless routers or video/audio repetitors, I don't know. I also have much iron in my walls. It is very strange that d-link can use very well channel 5 while other wireless cards/clients are unable to find any network there.
I am going to become creazy... if I was able to explain the situation, could anybody help to investigate some more or try to solve?
thanks a lot in advance!
Fabio

may be I have found the cause of all these troubles: the alarm motion sensors installed in each room.
I have made a search in the Internet and I have found the technical details of my sensors: microwave tecnology used by them is exactly using the frequency of 2.45 GHz :-/
So I have moved outsite of my hause the Airport Extreme and notebooks to confirm my suppose:
all channels were perfectly working, "auto channel" selection was ok, macbook was able to connect at 5GHz 802.11n mode. Windows client was ok too with all wireless cards or USB devices.
The alarm sensors seem to be always active and seems not possibile to have them completely off when the alarm is not activated.
I think I am going to switch them to a different version that does not use 2.45 GHz microwaves.
It seems the solution to my troubles.
Hopes this helps somebody else.

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