Unfortunately CommonCensus does not have a college basketball fan map, if it did it would show UConn dominating New England and New York. But they do have a football map. It dates from 2010, and here it is:
http://commoncensus.org/sports_map.php?sport=5
UConn is the dominant college football rooting interest in Connecticut but its football fan base doesn't extend much beyond state borders as of yet. However, UConn's fan base in this algorithm comes out bigger than those of Pitt, West Virginia, NC State, North Carolina, Wake Forest, Duke, South Carolina, Kansas, Oklahoma State, Kansas State, Iowa State, Purdue, Indiana, Louisville, UCLA, Stanford, Oregon, Oregon State, Washington State, Utah, Colorado, Arizona, Arizona State, and many other G5 teams.
In the AAC, the ranking is:
UConn 347
East Carolina 313
UCF 148
Cincy 137
Navy 97
USF 92
Memphis 69
SMU 42
Houston 37
Tulsa 25
Temple N/A
Tulane N/A
Other top non-P5 teams:
BYU 373
Boise St 241
Wyoming 183
Buffalo 129
San Diego St 106
Nevada 91
Army 84
Air Force 79
Fresno St 62
B1G does really well by this algorithm. Top teams nationally include:
Penn State 1397
Ohio State 1136
Michigan 1019
Notre Dame 994
Texas 873
Texas A&M 849
Wisconsin 751
Illinois 750
You can see on this algorithm that a school like Illinois really benefits from being the "favorite team" of a lot of residents of a populous state, even though there is very little passion for them, while Alabama (202) suffers from splitting a small state with Auburn (288) and doesn't get a lot of credit for the many out-of-staters who follow them and watch their games, but don't name them as their favorite team.
I think this illustrates the value of the B1G strategy. Rutgers (517) and Maryland (607) score very well, despite little history of football success. So do Minnesota (498), Iowa (483), Indiana (305), and state flagships generally. Syracuse and BC come out with big followings in this method thanks to a lack of northeastern competition. If UConn joined the B1G, it could steal most of their fans and get into the 600-700 range fairly quickly I believe.