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I was wondering if there is any benefit to use an Airport Express as an Network Extender to connect an Ethernet cable to my Apple TV?

Let me explain my situation...

I want to connect my PS3 and Apple TV to my Time Capsule router via Ethernet cable since I have a lot of other devices connected via WiFi (I thought it would be good to cut back on the WiFi load), but when I have my TC connected near my TV and Speakers the WiFi quality throughout the house is severely reduced. I assume it is because of interference from the TV and Speakers. I can move my TC to another location within the house but that means all devices must be connected via WiFi. This is why I ask if it would be beneficial to add an Airport Express as an extender near the TV so I can connect the ATV and PS3 via Ethernet? or should I just continue to connect these devices via WiFi?

I hope this makes sense. Any ideas or solutions would be appreciated.

Thanks