In some instances I've seen that you'll need two of those explora boxes, one for each explora. Run the satellite input and first explora output like I said above, but for the second explora you'll need to link the bottom two left outputs with the first box, to the top two left inputs on the second box, and then plug the second decoder into the second boxes right hand outputs.
The symptoms that will point to you needing to use this method are when the picture and sound start and stop almost every second when using two exploras on one box