Hey Snoop. Thanks for the advice on my post. This topic is a little more up my alley. Speaking in general terms outside of GMRS: The thing about electromagnetic energy (radio waves) is, it's literally everywhere already. Light, sound, RF, and even the more harmful X-ray and gamma ray energy are all propagating constantly all around us. For GMRS purposes the wavelengths are pretty long (2 meters ish) so the likelyhood of any harmful health effects are very slim even when standing very close to a high power transmitter. The main concern is much higher frequencies (several gigahertz such as those used for radar and higher) at very high outputs. The higher the frequency the more dangerous it becomes, and the same can be said for output power in those higher bands. There are many stories about sailors feeling physically warmer when standing in front of the high powered radar stations on naval ships. For this reason there are painted lines on the deck to help keep them safe. "Radiation" does not simply apply to all frequencies with regard to it's ability to alter cellular DNA. The frequencies required to do that have wavelengths that are incredibly small. That's a long explanation, but think of it like this, if RF energy were that harmful would it be safe to hold a 2 GHz 0.5W transceiver (your cellphone) up to your head for hours at a time? While claims have been made that it causes health issues, they are largely unsubstantiated and most have been debunked. All that to say, you'll be just fine using a UHF transceiver at 40W, or even 400W for that matter. Sent from my SM-G965U using Tapatalk