Originally Posted by chewy
Who told you this as it sounds like bollocks to me.
A radar is transmitting all the time it is turned on, even IF a VHF did cause a health hazard it would only do this when it is transmitting.
OK, that's because you don't know the effect of radiation on the body.
It is because the antenna converts currents which comes from the radio device into radio waves. The increased signal strength of the handheld radio antennas is achieved by concentrating the signal into various narrow discs and therefore, the signals are much more
focused. So it is received better by the receiver. At the same time the signals are moving to all directions (horizontally => line-of-sight system).
In medicine, Electromagnetic radiation and health are discussed quite widely and something called "Specific absorption rate" (Watt/kg) is used to measure it. So it measure the rate of enegry absorbed by the body or even tissue. That was a hot topic in 1990s when mobile phones first came!
Therefore, most radio manufacturers follow the guidance of US military/IEEE which has set out some limits on how much especially the handheld radios can be powered. Potentially, one reason behind not having a 25W handheld radio other than the limited bettery life could be this.
Whether it harms your brain or not, most researchers have found little evidence, but the limits have not yet been changed!