Microwave ovens.
Direct Satellite Service (DSS) radio frequency leakage.
The original coaxial cable that came with certain types of satellite dishes. Contact the device manufacturer and obtain newer cables.
Certain electrical devices, such as power lines, electric railroad tracks, and power stations.
Cordless telephones that operate in the 2.4 or 5 gigahertz (GHz) range. If you have problems with your phone or AirPort communication, change the channel of your base station.
Other wireless networks.
Nearby wireless devices using adjacent channels. For example, if device A is set to channel 1, device B should be set to channel 6 or 11.
Moving objects that temporarily place metal between your computer and the base station.