The higher the frequency, the worst it penetrates and the shorter distance it can travel.

Think your router. Most routers have two modes, 2.4ghz and 5ghz. 2.4ghz is far slower then 5ghz in terms of data rate, but can be used at a much greater distance.

Same principle applies to these towers. This new 5G network system can deliver up to 20GB/s (More commonly 100-300Mbps), but has a much smaller efficient range.

How does it do that? WAY higher radio frequencies mostly. Being that there's more towers closer together, and just being an overall faster system, the latency is far smaller too.

The effect on health I can't personally speak on since I'm not a doctor. Although this isn't a new technology, and similar broadcasting strengths have been around since the 90's.

So not really a conspiracy. The only true question is the effect on health. Like will it lead to an increase in cancer, could it cause some sort of disturbance in the brain, etc. None of that has really been solidified yet and the studies are still mostly ongoing.