Quite right Chug, though I suspect with the exception of the transmitting elements, quite a lot of miniaturisation could be done. The power issues however may be the main problem. Not only do you have the problem that a satellite has, in that you have to charge the batteries while operating the equipment (For those who have never had any dealings with the standard Comms Sat in geo stationary / synchronous orbit, they do have to operate in the shadow of the earth for a sizable period of the day), You also have the issue that unlike the Satellite, this thing cannot optimise the angle of the Solar panels to give the best power input from the sun and fly the course it has to do to stay on station at the same time.