I've been out of aviation and just now getting back after too many years. My strip ID is 36II and by looking at the FAA map I'm within the 30 mile radius that requires ads-b out. But I'm below their controlled airspace. What the heck? Do I have to spend all that money for ads-b even though I'm not in their airspace? I thought there was an exception under 2500ft, but is that only over 10,000 feet?