Minor adjustment to advice above...
It isn't a HIGHER channel you're looking for necessarily, but a less congested/inteference prone channel (frequency). If everyone around you is on channel 6, then you could head down to channel 1 or 13. Some devices will be configured to only allow certain channels, you may need to let it know the country you're in, as different governement regulations apply in different countries.
If channel is set to Auto then the modem/router will try to find the best channel (for all devices connected) to use. However this can lead to some areas of the house having weaker performance.
Setting the channel manually allows you to tweak the range/shape of the area covered well by WiFi as different frequencies react/suffer with physical environments/signal blocking pillars etc.
The best approach would be to open up (well install, then open up!) WiFi Analyzer on your DroidBOX. Check which channels are empty. If possible, try to be 6 channels (2.4GHz, above also applies but with different numbers on 5GHz channels) away from anyone else. When you change the channel on your modem/router, check if you need to restart just the AP part of the modem, or completely reboot the modem. You'll sometimes need to specifically save changes first. Once you've found the channel which gives you the strongest signal, with the least amount of competing (neighbours') WiFi networks near it (in terms of channels) then you're done.
http://droidboxforums.com/threads/wifi-analyzer.83/