OMG. I've not read much about 5G, but I did read that the waves cannot penetrate bricks, or in fact, skin. If they could, there would be no need for all the antennas to maintain the signal.
"5G as it currently stands will have serious issues penetrating into buildings..... But the extremely high-frequency nature of the 28 GHz band means indoor coverage will be very poor. Being that 80 percent of device usage occurs inside of buildings, this means consumers would be resigned to 4G LTE or even 3G in those areas. Even using the lower frequency 10 GHz spectrum means that 5G coverage would only exist inside of untreated glass windows, but likely nowhere else inside of a building." https://www.networkcomputing.com/networking/5g-will-hit-wall-literally-2019