Interesting, but of little real value. For example, look at the Redskins rather small area. Well, even a casual observation would show that the region south of Washington (well south) is still a hueg Redskins Fan area all the way down to Carolina (and even in Carolina, the Skins still have alot of fans, mostly older).
But for u, the Jets? Aye, I'd agree we're not a national fanbase team like alot of others, we we're probably not the majority-favorite team outside Nassau County and maybe a few counties in New Jersey. Thats how it goes when you share a City with the Giants.
Enjoy being an underdog.