Today is the first North American SOTA (Summits on the Air) Activity Day. Ham radio operators across North America will be hiking up mountain tops to activate summits by setting up portable radios to make contacts. You can join in and activate your own summit, visit here for more details. Or you can make contacts with activators, or listen in. Check SOTAWatch to see who will be on the air, at which location and frequency. Currently more there are more than 16 activations scheduled.