Here you go Kevin! I will start with a little basic info. . .
Summits on the Air (SOTA) is an awards program for amateur radio operators, encouraging portable operation from qualifying summits. The gist of it is, walk to the top of a mountain, set up your portable ham radio and antenna and then make contacts with people around the world. Of course, there are a few more rules to anything organized, but it is a fun way to combine hiking and amateur radio. Personally, I credit SOTA for getting me off my butt and back on the trails and into the woods.
SOTA and hiking the AT are a great match. There are a great many SOTA summits that are either directly on the AT or located very close to the AT.