[Signalman]

At UHF and above, how far you are from the xmtr/antenna is an important factor along with the xmitting power.

[GingisK]

The power of the transmitter and your distance from it are the ONLY factors that determine a transmitter's danger to you. For longer wavelengths, your body is transparent. Shorter wavelengths heat the water in your body, causing thermal damage. An AM commercial transmitter will kill you if you are too close to the antenna, even though that is long wave.

Once the wavelength is short enough, we call it "infrared light"; and, it is no longer radio. Shorter wavelengths are known as "visible light", and then "ultraviolet" at even higher frequencies.

UV wavelengths are over 1000 times shorter than the shortest radio wavelengths. So, radio does not impinge upon molecules. Radio can only transfer heat into your body, which is quickly dissipated due to the very low power levels you are experiencing.

The maximum allowed power of a cell tower's transmitter is 50 watts. If we assume that 50 watts is the energy level at one foot, then at 1000ft the energy level per square foot would be 1/1,000,000 of a watt. No heat.

Now consider the sun. That baby gives you 100 watts per square foot at ground level, some of which IS ionizing UV. The sun is way more dangerous to you.

Even that five watt transmitter you stick up to your ear doesn't impart enough energy to you to case a temperature rise. No temperature rise, no ionizing radiation, no affect on your health.