It is a good idea in a lot of cases to try different wireless channels on your router. You can do this through the web interface of your router. It is best to have another computer directly connected with a eithernet cable when testing which channel works best.

On the directly connected computer, click on start, run, and type CMD. In Vista/7 type CMD in the search. Click ok or hit enter. You will be at a black command prompt with a blinking curser. Type in ipconfig and hit enter. You will get a whole bunch of data. What you are looking for is the IP address. You may have one for your local area network connection and one for your wireless network connection. Find the appropriate one and take note of it. You could write it down or leave the command prompt open. It will be something like 192.168.0.2 . Now open internet explorer or your web browser. Type in the first three sets of numbers exactly as you found in the command prompt(192.168.0) , followed by the number 1. So in this example we will type in 192.168.0.1 in internet explorer. If your IP address starts with 169 it is not talking to the router and you will need to follow one of my documents on trouble connecting. Lets assume that there isn't a problem. You will see a screen that is asking for your username and password. It's asking for the default username and password for your router. There should be a card or some information in the box that came with your router that will tell you this information. In a lot of cases, it will be simply, leave the username field blank and type in admin for the password. If you can not find this information, check the link to the default username and passwords on my router center page.

Things get tricky from here. There are to many different web interfaces out there to give exact steps for every router. However, you should be able to find what you are looking for fairly easily. It's, most likely, a option under wireless settings. Odds are, you will have a drop down for channels 1 through 11. You may want to try 1, then 6, then 11 first. They have the biggest change in range of frequency. Apply the settings. Wait a minute or two. Then on your wireless computer try reconnecting to the wireless network. You may have to leave it on one for periods of time and determine the channel that is most reliable. Repeat the process, as many time as it takes, or until you run out of channels.