Slow internet connection via Airport Extreme

Similar problem.
Airport Extreme running v7.2.1
MacBook running 10.4.10
iMAC (new glossy 20") running 10.4.10
new MAC mini running 10.4.10
TIVO wireless (g?)

"Wireless client rate" on the MacBook is around 130 (+-20)
Mac Mini fluctuates around 54
TIVO is about the same.
iMAC is hovering around 1 and completely useless on the network. When I first set it up, it was hovering around 130, just like the Macbook.
I moved the Mac Mini and the Macbook to the same location as the iMAC (side by side) and no difference. It doesn't seem like interference if I've got the mini and macbook in the same location as the new iMAC.
Genius bar told me it had to be a location issue, but that isn't very satisfying because the MacBook hasn't slowed down any regardless of location in the house.

Same issue here... Directly to the modem, 10Mbps... Connected via Extreme, 5Mbps and less... NOT GOOD! I have a new one on order from the local Apple Store, they are replacing for free... I'll let you know if that works... They figure it isn't the MacBook Pro, because it was pretty consistent in the store...

I'm getting 6650 kb/s upload and 467 kb/s download on speedtest.net. My AEBS is set to "n" only at 5Ghz and the multi-cast rate is set at 24Mbps. Do those numbers sound right to you guys?

I had the numbers reversed...just tried again:

6675 kbp/s download and 474 kbp/s upload

Hello All,

I am setting up a network for a friend of mine. He has three Gb AEBS, one Linksys Gb switch, and a netopia/motorla router and Airport Express WiFi G. Everything is wired up correctly. I get everything to bridge properly and extend the network as it should. The network is closed so no unwanted clients connect, but no WEP or WPA protection is setup. I create the network and everything works fine for about a day... then the bandwidth goes from about 15Mbps to 3Mbps!!! NOT GOOD. I have gone through **** trying to set up these things, Apple should probably stick to just computers and ipodoid devices. Here are some of the things I learned after 8 hours of trying to set everything up:

-You need a Gb switch to connect a Gb AEBS or else the switch won't recognize it and thus the AEBS will not recieve a valid ip from the DHCP server on the router.

-You only need to connect one base to the switch, the rest just relay this one, mind you I am building this network in a european 3 story home made out of bomb-shelter grade steel and concrete. So don't talk to me about weak signals between walls.

-Only one base needs to setup the network, the rest just extend it. But I think that goes without saying, I was just an idiot at the time.

I am still in the phase of just getting the wireless network to work. After that I am going to setup 3 airTunes stations, 3 network HD for TimeMachine backup, 2 apple TVs, 3 Macbook Pros with TimeMachine, and 2 Macbooks with TimeMachine.

The problem I am having now is the choking of my internet, by the way the internet slowdown only happens when I connect wirelessly, otherwise via Ethernet, it works like a charm! I have been researching and I think that the problem has to do with mixed signals being used over the wireless on the Gb AEBSn. Unfortunately, and hopefully inadvertently, Apple does not make it clear that by getting a the AEBSn you will achieve n speeds!!! You also need to have a n network card, which none of the clients I am connecting has. Additionally, I haven't seen any network card for older Apple computers. I hope this is not foul play by Apple trying to sell these things!!! But back to my issue....

I have researched over and over these forums and finally I came over something that made much sense. It has to do with mixed wireless signals. http://www.appleinsider.com/articles/07/05/21/anin_depth_review_of_apples_802_11n_airport_extreme_basestation.htm1. Above is the link. Look at the Mixed AirPort Traffic section and it there lies a very solid explanation for the internet slowdown. It also dispels the many quickfixes that people have been trying to post. Unless you have n-wireless network DO NOT BUY THIS PRODUCT!!! By the way iPhones do not come with 802.11n wireless standard! Nor does the new iPod. Unfortunately, my client spent $450 on this network gear and it was all for nothing. Once again I hope that there is no intentional foul play by Apple.

If anyone does have any solution to my internet slowdown over wifi, I am all ears. However as of now, I think I am going to ask my client to just go back to the apple store and give back his AEBSn and just stick into good ol' Linksys. As for everyone else I'm sorry if you are still spending hours trying to configure your AEBSn.