5G wireless networks will revolutionize the future, and telecom companies have already spent billions to set up their networks and to fund new technologies that can use it. But, that’s not to say 5G is perfect. One major drawback has to do with the fact that 5G uses a mix of frequencies, with most of the attention on millimeter waves compared to the 15-40 centimeter-long waves used by 4G. Thus, shorter waves and higher frequencies have one big drawback: They don’t go very far. Whereas on 4G networks, you can go ten kilometers and barely lose signal. 5G maxes out at about 300 meters at best, and it can’t even go through walls or rain.