Will an Airpot Express Help my Connection?

Question

I have a Verizon FiOS Router that handles only up to G I believe. I pay for 50/25Mbps and get those speeds when wired, but I do not have any wired computers in my home. The router is behind my TV and usually has my Macbook Air, iPhone, a second home PC downstairs, and an Apple TV using wireless and an Xbox 360 hooked wired. The 360 gets great speeds using the wired connection.
But I only get about 9Mbps down on my Wi-Fi connection, and I'd assume it's because I have many thing using that one 2.4Ghz band.
If I were to purcahse this Airport Express which has two bands, and hook it up to my router, will this give me a performance boost? I'd mostly just use it for to put my Macbook Air and Apple TV on the 5Ghz band.
If not, do u have recommendations for what I should do to speed things up wirelessly.

Answer 1

The router is behind my TV
Imagine that the router is a water sprinkler (or a bright light). You want to get as big of an area as wet (or as bright) as possible. Would that occur with the current location of your router?
But I only get about 9Mbps down on my Wi-Fi connection, and I'd assume it's because I have many thing using that one 2.4Ghz band.
That is possible, but you may not be aware that in addition to having a good location for the router....as mentioned above....the wireless signal starts slowing down as soon as it leaves the wireless router....and....it will really slow down when it encounters a wall or ceiling in the signal path between the FIOS router and the wireless device.
To see if that might be part of the issue, take a speed measurement with your computer close to the router, then compare at other locations to see how the signal is affected.
If I were to purcahse this Airport Express which has two bands, and hook it up to my router, will this give me a performance boost?
It might, if you position it in a good location and connect it back to the FIOS router using a wired Ethernet cable connection. 
Keep in mind that 5 GHz signals are much weaker than 2.4 GHz signals, so they really only work well when the router and wireless device(s) are in the same room, or have line-of-sight with each other.
One of the nice things about buying from an Apple store, is that you have a 14 day money back, no questions asked guarantee. That's really useful, since you cannot really know whether a new device will help or not until you try it out in your home.
It would be unusual, but also possible that things may be worse adding a new router due to wireless interference. Wireless is more black magic than science, so you have to be patient and expect that the process may be two steps forward, one step back as you go.