Channel 14 is entirely illegal to use in the USA (and many many many other countries) because it exists outside of the 2.4Ghz spectrum that is allocated for consumers to go nuts on. So yes, you're Wifi will be awesome because nobody is using that spectrum
.... but you'll really piss off the FCC, ask your local HAM why this is a bbbaaaddd idea.
That being said ...
Using channel 14 in the USA (and other non-channel 14 countries) can be done via a DD-WRT compatible router, and Wireless cards where you can change the CRDA to Japan (like Atheros cards that work with ath5k and ath9k on linux.)
The linux command to change your regulatory domain is:
bash# iw reg set JP
The issue with channel 14 is that it is reduced power, meaning in most cases you'll only get 802.11b speeds with it.
Now why something is critical as wifi has to exist with stupid consumer shit is the real crux of the issue ...