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There is one WiFi access points in range of my room and it's mine. Using the WiFi Analyzer application for my Android phone, I've found that the entire channel range is wide open. currently, I'm using Channel 6. Would changing the channel have any impact on signal strength if there's no other WiFi access points around?

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It might if there are other devices in the same frequency range (like cordless phones).

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How can I tell what frequencies are being used by other devices? Is there some kind of tool that detects all signals on all channels? – Thomas Owens Jul 28 '10 at 1:25
For wifi you can use metageek.net/products/inssider for everything else you would need a freq scanner, a local ham radio club could hook you up with that. – MrStatic Jul 28 '10 at 1:36
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Don't know of any tool, the best way is to keep changing channels until you get the best signal. – Moab Jul 28 '10 at 1:37
+1 @Moab - since there are no other networks around, it shouldn't be too hard to just find a good channel. – JNK Jul 28 '10 at 1:44
Moab: There are 14 available channels. Running downstairs to my wireless router, changing the channel, then running around the house to check on signal strength would take a long time. I would like to make this short and simple. – Thomas Owens Jul 28 '10 at 10:17
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There's a couple of devices that also transmit on the same band as wifi.

Check out this wikipedia article for a list.

To quote a page on Cisco.com:

Jupiter Research reports 67 percent of all residential Wi-Fi problems are linked to interfering devices, such as cordless phones, baby monitors, and microwave ovens.

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