Best setting for my set of devices

I would like to know what would be the best settings to get the maximum throughput for my set of devices.
Last night both Airport Extreme and Airport Express were updated with firmware to 7.5.2
1) Upstairs I have an Airport Extreme. Newer version with 2.4gz and 5ghz bands. This is connected to my AT&T Uverse router/modem. My iMac is ethernet connected to the Airport. Running speed tests I get almost the expected speeds of 12mbs download and 1.5mbs upload.
I had setup a 2.4ghz network and a 5ghz network but may not have used the best settings for my environment.
2) Downstairs is an Airport Express. I is a "n" version
3) Connected to the Airport Express via ethernet is a small ethernet hub and connected to that are 2 Dishnetwork 722 DVRs. Each 722 has a Sling Adapter to allow viewing the contents over the internet via iPhone, iPad or web browser. This was the goal for the Express, to supply that info.
Getting max speed out of this Express is important to get the DVRs output out of my house and to my iPad or iPhone.
4) These are the following devices that are connecting at the house via wifi:
a) iPhone 4
b) iPhone 3g
c) Apple TV newest model and is downstairs next to the Airport Express
d) iPad
e) Macbook Air first generation and this is used downstairs in the same room as the Airport Express
Using Airport Utility it appears that all devices show 80211.n and 5ghz except the iphone 3G, which shows 802.11 b/g AND shows it attached to the Airport Express even when I'm next to the Extreme.
From the Airport Utility, I've seen the values fluctuate but here is what shows Signal, Rate and Noise for each device as a snapshot on the Airport Extreme
iPhone 4 -44, -96, 65
Airport Express -59, -96, 144
Apple TV -70, -96, 52
iPad -50, -96, 65
Macbook Air -24, -96, 216
Using the Airport Utility, the Airport express show these values
iPhone 3G -66, -85, 54
Airport Extreme -54, -86 104
Let me know if you need any other details.

Any advice on the best Airport Utility settings for the Extreme and the Express?
The default settings work very well, so unless you have a specific reason to change them, I would stay with those settings
Should the Express extend a network or join a network?
"Extend" provides more wireless coverage in the area where the Express is located. "Join" provides better bandwidth if you are using only for iTunes, etc. Most users want more wireless coverage.
If I were to extend at network, should the Express extend to the 5ghz or the 2.4ghz
If you have good signal strength at the location of the Express, 5 GHz will support up to 270 Mbps bandwidth. 2.4 GHz will support up to 130 Mbps. You want as much bandwidth as you can get for high definition video performance if you are using wireless. If you have an option to connect the DVRs using ethernet, that will provide the best performance.
The iPhone would have to connect back to your main router if you set the Express up for 5 GHz. It is not easy to extend 5 GHz. You literally have to have very close to a line of sight situation between the main router and the Express for this to work.
If I were to get another Extreme, should it join or extend the network on the Extreme upstairs.
The Extreme does not really do anything if you set it up to "join". The ethernet ports are not active. All you would be able to do with the device in this setting is attach a printer or hard drive to the USB port.
Any documents that would explain the best choices for linking 2 Extremes together?
Apple AirPort Networks is a very good guide.
If you are linking two routers together, an ethernet connection is always the "best" way to do this because it provides maximum bandwidth performance. Up to 1000Mbps with ethernet. "Extending" using wireless only can work well if the "extending" AirPort receives a very strong wireless signal. Ideally, there would be a line-of-sight situation between the devices or close to that ideal.
Message was edited by: Bob Timmons

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