See release thread :
Hi Kerbonauts around the world
Ever wonder what all the antennas you put on your craft, because they look so cool, actually do ? How far can you go with them ? How many science you'll be able to send back when you get there ?
It's easy ! Just multiply the power of your strongest antenna with the result of the division of the sum of all your antenna's power by the power of the strongest antenna raised by their average weighted combin