That's why TV frequencies got freed up (600MHz), and are also used in 5G: they travel great though walls. And one or two stations serviced a city. The FR1 rang

That's why TV frequencies got freed up (600MHz), and are also used in 5G: they travel great though walls. And one or two stations serviced a city. The FR1 range is nothing new. Yes, FR2 ranges (aka mmwave) has more potential for higher speeds partly _because_ it doesn't travel through walls, you need practically line of sight. (Spatial multiplexing). And you cannot simply amp up the power, to get through it as reflections will drown you. Different use-cases, different frequencies. And those frequencies are still non-ionising, and at most heat your skin. So why the qualifier of "safe" for frequencies? We are talking radio here, not UV, x-ray or gamma.