not sure where I was talking about dangerous radiation, but ya something about the signal, but any way the answer for op is they don't need to come into home
A radio signal is radiation, same as light is, it's electromagnetic radiation. That's also given off by every power cable from the charger from your cellphone all the way back up the line to the power plant. SOME frequencies can cause problems, but that's why you have the FCC and stricter rules on radio frequency emissions than here in the EU and in most, if not all, other countries in the world.
As I say, anyone who says there is a risk from these things needs a different type of tinfoil helmet.
For the record, the rollout of smart meters across Belgium is going to be mandatory as of 2019, EU directive. The electric companies own the meters, and it's illegal to stop them getting access. Where possible a dedicated landline connection will be used, apartment blocks being the obvious one there. Otherwise it's either a cellphone or wifi connection as there is provision to add a dedicated wifi "line" via someone's home router since the main players install routers with a special "public" account for their subscribers, completely separate and secure from the "home" connection. You wouldn't notice any difference in speed, in reality, especially when even my wifi fires out a download speed of 96Mbps and less than 10% of the country gets under 10Mbps on DSL.