Have you reenacted before?... What type of unit are you seeking... US, CS, Mainstream, Campaigner.... not sure yet....
"Based in" is a fairly relative phrase as a generalized region..... Unless a group has limited itself to close in Living History programs only... where a given unit may be based is usually a secondary issue these days... Events scattered across the mid-atlantic region and beyond.... most groups do a bit of traveling to events anyway... So where it may be based in tends to not be that big a deal.... Heck my unit technically based in Virginia... had some members in it that lived in Ohio, Illinois and Mass.... Of course they might not have came to the small local programs... but were there for the larger stuff.... A host of different groups around Northern Va, Maryland, and Pa not that far from you.... May be a feasible consideration to start...