The "standard" channels for 802.11g or n use multiples of the old 802.11b (11Mbits/sec) channels.
54Mbits speeds are attained by using channels 1, 6, and 11, with the high speed signal spilling over so that channel 1 uses -1,0,1,2, and 3; 6 uses 4,5,6,7,8; 11 uses 9,10,11,12,13.
You can sometimes "shoehorn" your data onto an intermediate channel, such as channel 10 suggested above, with slightly better results than trying to complete directly on 1, 6, or 11. A much better solution is to use a dual-band Router that can get away from the competition on the 2.4GHz band and move to the 5GHz band. There are several good dual-band Routers on the market, including all of Apple's current Base Stations.